eXch almost always has zero XMR reserves (like most exchanges) ... they over 100 BTC in stock and not a single Monero ... maybe they don't care.

But from what I've seen, they have a very low price for XMR (considering the market), and coins sell out very quickly ... They clearly don't want to hold Monero, they want to get rid of it as quickly as possible, and that's how it suits them.