The logic in that case isn't really that twisted. One single guy growing more than allowed for personal use won't move the market but if the court ruled in his

The logic in that case isn't really that twisted. One single guy growing more than allowed for personal use won't move the market but if the court ruled in his favor anyone would be able to do the same which would reduce the demand for wheat. If the government has the authority to regulate price controls at the national level control of all supply is kind of required.