Where is all the bio fuel?

So, why does the tax payer pay farmers to do nothing, i.e. set-aside etc.? If we pay them to do nothing, they might as well grow bio-fuel. Talking to my wife's sister and her husband who work in agriculture, they agree, and have been saying similar for around 5 years. Beaurocracy is just swamping and restricting farmers more each year. Why do we do this? Other EEC countries such as France, pay lip service to all this stuff and stick up for them-selves, good for them!