That`s true - it`s really difficult to make arbitrage without some kind of intermediate (automated algorithm) fast enough to capture arbitrage opportunities between markets and that`s the reason, why there are more and more arbitrage trading platforms emerging.
If somebody is interested, feel free to try out our recently released beta version of arbitrage trading platform (- free trial for 1 month). You can make arbitrage directly between markets (without any extra withdrawal confirmation needed) and exchange fees are always pre-included into the profit calculation, so you will always see the final profit with exchange fee already included. To trade with KRIP.TO you just have to connect your exchange accounts to the platform (only API needed) and our algorithm will start automatically search for arbitrage opportunities among connected exchanges and provide you with a real-time arbitrage trade opportunities. We support two ways of arbitrage trading: semi-automated (capture custom opportunities) and fully-automated. More info on
http://beta.krip.to.