They do apply a spike in coin prices when buying and then short you when selling all while charging a fee. Ku Coin, Abra and Coinbase are my go to. They call the spikes and shortages slippage, b.s. Its a money scam. Just like when a coin keeps getting bought and the volume is up 9000% and the price of the coin doesnt go up, well alot of that money stays with the exchange. Cant wait to see what US regulations will say bout this scam.