Right, but coinbase is charging us so much for each transaction and taking fiat money out of it...
I think any "easy" arbitrage like that won't work - the difference is there because it's impossible to trade
It is not the problem of the fees, the real problem is that most of the guys who are having 1 or 2 bitcoins, or even more, are not going to risk their balances in order to make a quick arbitrage.
The only ones who are doing it, are those who have less than 0.10 or 0.05 on their balances, and they are not afraid of losing their money.
Why do you think that you have to afford expensive fees and comissions that came from the air?
If you could have more than one bitcoin on ur balance and you start doing arbitrage, you would earn a lot, but if you have less, then the fees are going to eat all your profits