Have you personally made any profit with this so far? Moreover, I don't really think a decent profit can be made if you buy from one exchange and then transfer the money and sell it on the other exchange. I think either the withdrawal fees will eat up your profit or the transaction time would autocorrect the price at parity. A better approach and how most people do it is using futures. You buy in a spot where the price is lower. Sell in Futures where the price is higher, then transfer the spot coins to the other exchange and square off both the positions. This way you can at least beat the transaction time. But Hefty withdrawal fees are profit killers unless you have 1 Million to Arbitrage with.