I can certainly understand why some people would try to 'game the system' and get PR simply for benefits with no intention of living here. That's not us.
Simply put, in a more hedonistic light, we're travelers. We love to move around, explore, and immerse & create in different communities. I lived in four other countries before coming to Canada. Moving around is just our thing.
Put in a more logistical light, our lives required moving around for our plans. We will be starting a business in the US, but if we wanted to end long distance we needed to be in Canada for a couple years before that (due to wife's career, schooling, etc). So yes, it will be a couple here, a couple there, and then perhaps we'll return here again. Who knows.
Maybe it's just the traveler in me, but I don't find it strange at all that people would want to come and go. And though I understand why it's necessary because of fraudulent people, it still baffles me sometimes that being married is not simply enough to legally stay with your spouse in a country- and be able to easily come and go- without claiming any intention of staying permanently. But since that's not the case, PR for nomads it is. ;-) Hope that makes more sense.