They don't have trading fee yet.
Alot has happened because of the model of trading fees which has cause alot of people to back out and crash the market, which is very low at the moment. I would like Cex to take this as a sign that people are just not willing to deal with a fee tacked on to the main source of reaching ROI for smart investors. This is a stretch I know, but you are not a company without your customers. Some will stay, but the ones with money, the ones you want, will most definatly go.