OK, I get you. But yeah, you've then taken away all the upside, but have no way to intervene on the downside, so inevitably the value of your coins is going to drop, possibly fast.

Maybe there's a middle way where you only take away _some_ of the upside by printing money but not enough to stop it rising too much, but it sounds like it would be hard to figure out what that was in advance, which you'd have to do if you hoped to specify this stuff in an algorithm rather than having somebody driving.