Well - the problem is that people will hire munchkins who will "babysit" homes and will go into them once a day to flush toilets, run the dishwasher and so on.

It's pretty easy.   The flow of foreign capital into Canada was excessive and has created problems for locals (beyond simply causing housing prices to increase to a level where they are no longer affordable for a significant proportion of the population.)   A lot of this money seems to have come in through the Quebec investor immigrant program (and it's interesting that the money then makes a bee-line for Vancouver, Victoria and then Toronto).   The people in Quebec aren't suffering the ill effects, are they?   Perhaps if the money had to be used in Quebec, the problem would stop.