I still fail to see the "scam" in all of this. As for expenses, you do realize as a couple your incomes are family income and expenses are family expenses? Did you think you get to pocket all your money? You wanted 5 kids? You know you would have to give her money to pay for clothes, food, etc? I have heard of a lot of really ingenious scams, but none that make you (the scammer) financially responsible for your victim for 3 years!
As for the marriage fraud article:
That is just WRONG! Any attempt to deal with marriage fraud has to occur after landing. You can't do it before. Tell me all of you, if CIC told you your partner was scamming you would you be thankful and call things off? Of course not! All those new rules do is make it harder for EVERYONE to get their spouses here in a timely manner.
I would say that since you are sponsoring your spouse, if that person ceases to be your spouse you can send them back. Which is similar to the new legislation brought in anyway. But the main point is they need to pursue and prosecute scammers, and the scams normally will not become known until they arrive here. It is a lot easier to keep up appearances in email, chat, phone, skype, and on short trips than when living 24/7 with someone.