Because if there is a sign that a regulatory strategy is ill conceived, it is when you end up paying farmers not to grow crops, and this appears to be one of the new cash crops for the American farmers.
This is a fraud foisted on the American consumer and the environment, much like the construction of unneeded hydroelectric plants in China for carbon credits on the European cap and trade system is a fraud on the European consumer and the environment.
The solution, which is cheaper for the consumer, and keeps the Wall Street types from gaming the system, is the straight carbon tax.