The platform would have to eat the loss, much like central banks do when they try to maintain a peg.
Hmm. I don't know if that's healthy or not for the system. Seems to me, the more controls you try to implement to get the desired effect(s), the more points of failure you now have to deal with. More factors, more complexity, more likely to have problems down the road.
RE: Why not peg SBD at $10?