Well, at the very least those producing the sterile plants have to keep fertile plants. There are actually plant lines which are more or less sterile and can't

Well, at the very least those producing the sterile plants have to keep fertile plants. There are actually plant lines which are more or less sterile and can't really reproduce sexually any more, because they have been (naturally) cloned. The point is that modern breeding schemes and technology is necessary to feed the growing world population. There is no margin to reduce agricultural performance. You will feel any loss in performance immediately through price hikes.