Why assume they'd only want to distort prices up rather than down?
On the contrary, it seems to me that "banning selling, not buying" could be a useful tool for helping out some hypothetical buddies who would rather that a large tranche of 115s & 320s don't end up very inconveniently in the money.
On the contrary, it seems to me that "banning selling, not buying" could be a useful tool for helping out some hypothetical buddies who would rather that a large tranche of 115s & 320s don't end up very inconveniently in the money.