Seems a bit patronizing to assume that farmers will buy a product that does not work, then continue to do so after it had proven that it yields no advantage. If it were the case that the advantage lasts only two years, then nobody will buy the product on the fourth year.

Lastly the "patented life" argument is incorrectly attributed to GMOs. First proponent of patents in this field was no other than Luther Burbank (1849-1926), a pioneer in agricultural science. He had spent the better part of his life arguing for a means to protect his achievements. Finally the Plant Patent Act was passed in 1930, some years before his death. As it stands now "life was patented" for 85 years already, while the first GMO appeared in 1994 only.