Keep in mind that a lot of those private farmers around Regina are farming between 10,000 and 20,000 acres. I've heard of some guys running as much 50,000 acres. Not exactly the 800-1500 acre places I grew up around. With minimum/zero tillage a lot of them only see each piece of their land 3 or 4 times a year instead of the 6 or 8 times a year we used to, and they crop every year, so there's no summer fallow. When you start looking at that kind of economy of scale, a $300,000+ machine starts to make a lot of sense given the reduced input costs per acre. Things have changed a lot. About the only thing I know how to do on a large modern farm is get out of the way.
So the big guys own their own. The smaller places (and there are still guys trying to make it on a couple of sections) either use smaller (and much cheaper) equipment or hire it out to custom sprayers.