This. The risk vs return on arbitrage right now isn't very good. That's specifically because of order execution time. If everything were as liquid as forex those of us who have traded prior would be making a couple million a day pushing coins across multiple exchanges but its just too slow right now.
To be fair, the risk/reward of simply trading BTC is a big gamble hour-to-hour anyway. If you are approaching this like entertainment/gambling, then it's cool, but I can't stress this enough...
DO NOT TRY TO RETIRE BY INVESTING IN BTC