You'll have to ask farmers what they think about patented crops before you dwell too much on them being "screwed over," as you put it. Yea, they'll grouse about the cost of seed per bag, it's really high. But, you'll also find that farmers willingly buy this stuff because that fancy patented technology is amazingly effective. In 2012, a year when we had significant weed pressure, insufficient precipitation, at least one significant hail event on our field, and a couple of significant windstorms: that crop still grew. It didn't get drowned out by Lambs Quarters and it didn't blow flat on the ground. It yielded fairly well under stress. We could go out and acquire non-hybridized seed from the pre-1950s era that would grow well year after year if we wanted to. It'd be pretty dumb for us to bank everything on that though. When you throw all of your cash, and a hefty quantity of loans into the ground in the hopes that it'll be decent 5-6 months later, some degree of greater predictability is very much appreciated. It might even be worth paying an upcharge for $200 per 80,000 kernel bag* if it means it saves you on insecticide/herbicide applications later in the growing season.
*That's about a penny per 4 seeds you put in the ground, and if you're a small operation like my father, you're tossing ~32,000 - 34,000 of them in the ground per acre. So about 8,000 dollars per acre in seed. That means while you're planting, you're putting about your yearly expected profit into the ground about once every hour while you're operating(in seed alone). If the product didn't provide value for that investment, you wouldn't buy it.