The only people who make money on cex.io are the ones who got in very early and the traders riding the price downwards while extracting value from price swings. Everyone else loses.
Actually, the ones that got in very early lost the most because cex.io shares are less over-priced now than they used to be. The only people that make money on cex.io shares are cex.io and some of the traders. Most of the traders and all of the miners lose.
Does this mean I'm one of the 10% who win? Cool!
But the quoted is correct, as those who bought early have a LOT of BTC they still have to pay off before they can see a value return, while the current price is almost 1/2 of some of the original prices.
But yes, it is possible to win. However, the entire things is a negative sum game.
Ironically, the fees are less than a minor nuisance. I've traded fine with the fees, and the price swings you need are very minor, about 3000 satoshi to pay off the fees. Very. very small. And the market fluctuates wildly, on a good day, and so you can get 10,000 or more satoshi from a single gigahash. Get it on an even better but still quite common day, and you're just made 100,000 satoshi.
But it could be true that everyone but some traders lose. But why is that? Is everyone not very good at trading...? (And don't give me the "fees" bullcrap. If you think you changed from Forex to Bitcoin to avoid broker commissions, you're very, very wrong.)