You're assuming that they can control the price. It would be simply stupid to sell something for $65 when you could sell it for $90. But if they need x amount of total dollars, they will sell how ever many barrels at $65 to reach that number. At $65 they can still cover costs, and they have endless reserves. At worst, they are selling something cheaply today that they could get a better price for if they held out. Other producers are not in that position which can destabilize many parts of the world.
Beats sales will crash once this becomes well known. Wearing these will no longer be a symbol of status, but of gullibility. Hats off to Dr. Dre for making a killing on selling an image rather than real high performance headphones.