There is really limited risk, if you collect a decent down payment. Even then, risks can be mitigated. There is really little risk to buyer or seller. Generally, over time, real estate prices increase. That's been the way since time immemorial. Yes, markets can decline for a time but, if you can afford to hold on, the market will recover and exceed its previous high water mark. That means, the borrower (in legal parlance the mortgagor), will be motivated to keep up the payments.
Should the borrower be unable to keep the mortgage in good standing, then what? Well, you, the lender (mortgagee) will no doubt be asked to offer some accommodation, such as temporarily accepting lower payments, or some such. The borrower might see scant prospect of recovery any time soon and they might seek to salvage some or all of their equity in the property by selling it and paying you out. The only risk you face as mortgagee is that, if the mortgagor is selling into a weak market, that has experienced serious decline, then the property will sell for less than what remains owing against it. Than can happen, particularly where the seller has taken a down payment of 10% or less. But on say, a $500k property, if you take 20% ($100k) down, the property will have to decline to $400k in value before you are at risk. It's the purchasers who will have lost their equity of $100k.
The worst case scenario is that you have purchaser(s) who have lost their equity in the property, have stopped making payments and are continuing to occupy the property. Yes, then you a pretty much faced with retaining a lawyer and commencing foreclosure proceedings. If there is no equity in the property, that can be a somewhat summary procedure. You get an appraisal showing the property has a negative value from the purchasers' perspective and the longer it sits there without being sold is costing you money. You can be sure that at point that they are also not paying property taxes, insurance, etc.
Ordinarily, in foreclosure proceedings, the first step is to get from the court an "order nisi" of foreclosure. The word "nisi" is Latin for "unless". The borrowers will stand foreclosed "unless" they pay up. The usual time for that order to run for 6 months. The purchasers have 6 months in which to "redeem", meaning to come up with the money to pay you out. But, if there is no equity in the property, you can ask for an abridged redemption period - as short as one day. During the redemption period, either side can ask the court for an order for sale. If there is some, but limited equity in the property, the lender can both ask for the order as well as for an order for "conduct" of the sale. The lender gets to select the realtor, listing price, etc.
So, let's say the redemption period has run out, there has been no sale, no redemption by the purchasers. You go back to court and ask for a "final order of foreclosure". That has the effect of reconveying the title to you. You then own the property again and are free to sell again, rent it out, or do as you please. The borrowers are really not out of the woods at this point. Let's say that $500k house sold for $300k during the process. The mortgage debt was originally $400k. Presumably, unless it was an interest-only mortgage, their monthly payments would have reduced the principal debt somewhat. So, let's say that, in the end, the balance owed was $380k. In the foreclosure, you would have obtained a "judgment on the covenant" for $380,000 plus costs. So, the purchasers now have a personal judgment against them for any deficiency. The judgment is good for 10 years and may be renewed. You can take all kinds of steps to enforce it. You can seize and sell assets, such as their BMW, You can take out a garnishing order against their wages, bank accounts, etc. You can summon them (once a year) to attend an examination in aid of execution. You may find yourself, in time, in the happy situation of selling again into a recovering market and making money. In short, it's not all doom and gloom.
When I bought my Kitsilano property, I was living with my high school sweetheart. She, too, signed the agreement for sale as covenantor. She was all worried about us taking on a large debt. She was also a UBC student, with 2 more years to go for her masters. I was 8 months away from starting my law articles. I told her that, if we could not keep up payments, so what? We would sell and get out. Absolute worst is we would lose our deposit. Even then, so what? We were young and likely with decades ahead to recover the loss. It would have been worth the try. And it was. We managed, and that early venture into Vancouver real estate provided us with financial comfort for life, we would not otherwise have received.
Doing what we did was not all beer and skittles. There was sacrifice. For a few years, we did not eat out, take vacations, etc. For the first year of ownership, I parked my car in the backyard. I had a choice of paying the mortgage or insuring and operating my car. I chose the mortgage. We accepted the idea of living with tenants. The house was a legal duplex, used as a triplex, which was standard in the area. We rented the 2 basement bedrooms separately. A UBC law student lived in one for the first year. A Greek fellow, who spoke no English, lived in the other room. We inherited him as a tenant from the vendors. He was living there when we bought. In fact, his room had a padlock on it and we never saw that room until he moved out after a year. He moved out when I asked him for a rent increase of about 3%. But, he was okay. Usually not around. Only on Sunday mornings for the most part was his presence evident. Then he would play loud Greek music and chain smoke. The smoke would move through the rest of the house via the heating ducts and, as well, come up the stairs from the basement and seep under the door. Because it was not a true triplex, the internal staircase has never been removed and there was a door leading from our kitchen to the basement.
Having rental income basically paid the mortgage. That left us to cover utilities, property tax, maintenance, insurance, etc. So we paid out no more than we would have paid to rent similar accommodation. After awhile, we rented the whole basement to 2 married students. The rental market was then soft and we had to cut the rent to find tenants. Something not seen in Vancouver in recent years - declining rents. But it can happen.
I could go on and on, and some here could go on and on calling me a liar. I find it offensive and defamatory, but I'll get over it.
Endnote: I mentioned our Kits house being vendor financed by a device known as an "agreement for sale". Still valid, but less used in recent times. Vendor financed mortgages are more common. Not a lot of practical difference between the two. But, with a mortgage, title to the property gets transferred to the buyers, with the mortgage registered against it. But, lawyers know that the mortgage has the effect of transferring "legal title" to the mortgagee and leaving "equitable title" with the mortgagor. The mortgagor has the "right to redeem" and to a conveyance of the legal title upon making full payment. With an A/S, the title remains in the name of the seller and the A/S is registered as a charge on title. In case of default, one does not apply for "foreclosure". One applies for "cancellation" of the A/S. In cancellation proceedings, the standard redemption period is usually 3 months, not 6.
Maybe not now, but we could also get into the niceties of second and subsequent mortgages, rights of junior encumbrancers, priorities, etc. We could also talk about pledges of title documents as a form of security. All very interesting (to some of us).
I forgot about it in responding to the initial "liar" post, but while I was living in that Kits house and paying on it, my sweetheart and I bought a small parcel of oceanfront in the southern gulf islands. Again, the vendor financed it. By that time, I was working as an articled student. She had finished school and just got her first job, as I recall. Again, we would never have obtained a bank loan, not for a remote, vacant lot and us with limited income and assets. We paid 25% down. The vendor said "I will finance, but not on the 'never never plan'". He said by that he meant he wanted a large down payment and monthly payments that would see the debt paid quickly. So, we ended up with a mortgage with both a 5-year term and a 5-year amortization period. The monthly payments amounted to almost the full amount of my salary as an articled student. It was tough initially, but our incomes were rising and it got less burdensome as time went on. Where we lived was always our #1 priority. For years were paid out more of our income for our housing than the so-called "experts", including the banks, advise or allow. I think the rule of thumb is about 30% or thereabouts. There were extended periods where we paid, quite contentedly, more than 50%. Yes, we forsook restaurant meals, a second car, a new car, trips, etc. But vendor financing helped us immeasurably. Some may call it unusual in the extreme, or a tissue of lies if it makes them feel good, but that's how we got our start.