The lack of liquidity that exch has is due to them not being able to supply enough coins. They already have the buyers that are willing to pay 5%+ in fees and who eat up all the available supply in less than 24h, so what they need more is monero sellers to sell on exch (instead of some other places).
How do you incentivise people to sell on your exchange? By offering better prices.
The volume of XMR over the last 24 hours for eXch is 6776.91 .
I have the impression that eXch no longer really suffers from liquidity problems with XMR.
On exchange volume is not indicative of liquidity problems, disposable coins are, or how easy it is for them to resupply. This is what is hard and hence why I made the initial post.