It doesn't matter how many of you there are. What matters is how many contracts or options on same farmers are willing to buy.

The problem in trying to run a corner on any thinly-traded commodity is "how do you get back out?" Unless a lot more liquidity comes into your market, you'd have to be very slow and steady about how you get out of your position(s), and then only the early money in and out makes a profit from the move.