I think it's high time that btc-e dropped all those nonsense dinosaur coins and replace them with XMR. It just makes sense.
The longer they take to add Monero while keeping these shitcoin, worse are their perceived image overall IMO, Cryptsy e.g. has 0 trust from me now.
These exchanges might not have the technical ability to add XMR. When Mintpal upgraded to V2.0, most bitcoin clone coins were stolen by the owner, but not the XMR as he did not figure out a way to do that.