Because you get far higher ROI for the large-scale installations. In case you weren't familiar, Canada has a lot of other things which need the money than paying 5x per watt to subsidize panels on your roof instead of on the ground.

>One works better for people not living in cities

It's not as if homes outside of cities have their own diesel generators to power their house.

(Since I'm guessing from this line of comments you'll point out the less than 1% of people who actually do do this, maybe it's better to focus only the 99% here).