The whole getting paid not to farm is a myth.
That is what I was going to say. You get subsidies per acre for declaring, then at harvest, no? I feel like the farmers really get a rough deal, coerced by both the government and the seed/chemical companies.
Personally I think the problem is we're subsidizing crops that do not necessarily feed people (unless you count it as livestock feed). If we're going to subsidize production (which I don't necessarily agree with), then at least expand it beyond just grain and soybeans.