maybe we need to charge negative fees to incentivize XMR-> exchanges

That's going to be fun for referrals

Monero prices and shortages were discussed a few times in
eXch's thread. Eventually they charged 5% to buy Monero, and 0.5% to sell it. They used the Monero price from centralized exchanges as base, and it looks like supply and demand aren't in equilibrium at those prices. My guess: people don't withdraw from centralized exchanges, as it makes no sense to expect privacy there anyway. So it would be interesting to see negative fees for selling. Maybe start with a small negative, combined with a small increase in fees for buyers.