I do disagree a bit. Not an expert, but if you avoid the debit card Coinbase fees and then use Advcash once you get into Dollars on Exmo it made money if you avoided Bitcoin and they never had my money for more than 2 minutes. My background is conventional FX so a 2% low risk trade is a dream. They have discontinued the debit card now In the last few days though which spoils it as other withdrawal methods are more expensive so I will have to look elsewhere. I agree there probably arent millions to be made anymore, but I think you can at least make cashing out less painful by being smart and there are small opportunities.
Hmm, if you're really interested in arbitrage why not do some bitcoin sports book arbitrage? What you said can definitely work, but the thing is markets are going to move and there are going to be unexpected delays and fees, that would make your entire working capital be stuck at one stage of your arbitrage plan. If it doesn't happen this time, doesn't mean that it won't happen forever.
You're going to have to go high volume, if you're really going to make a profit. Bitcoin withdrawal fees can take up the majority of your profits if the margin is only 2% and you're working with less than 1 BTC.
All i can say is, good luck. Why not try it out and see what happens? If it works, you can share it with all of us your experiences. If it doesn't work, you can warn us what steps to take care of or why it didn't work. Also, have you tried alt coin arbitrage?