You're just moving the responsibility around. Someone has to be responsible for arbitraging risk/supply/demand over a long time period. It could be the buyer/

You're just moving the responsibility around. Someone has to be responsible for arbitraging risk/supply/demand over a long time period. It could be the buyer/intermediary or the supplier. Generally, regulation on how the market self-optimizes is not good, because it will be sub-optional and the market will try to optimize around your roadblock, which simply creates additional inefficiency.