Thanks Magneto, I have tried it a little yes and accumulating bitcoin rather than fiat. I'm in a position where i can give it a practice run and see, so I might do a sort of research blog on it for the results. Should be fun, I'll let you know how it goes.

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 aren’t 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.

Thank's for your replies everyone. Keys seem to be sending the coin quickly and avoiding fees. Bank deposit in Coinbase, Buy Litecoin send to GDAX for free, then send to Exmo, sell for Dollars has been a relatively fruitful endeavor, probably worth the effort of getting validated. I've found Using Ripple inter exchange is cheap and fast so that works well looking for altcoin/bitcoin arbitrage, but other coins can be expensive and slow as I'm sure everyone knows. Like everything their seems to be tradeoffs, its more of a grind than buy and hold but arguably safer as you have a cushion. I'm sure there are glaring opportunities somewhere but those people aren't going to give away the golden goose 

Anyone out there use this site for arbitrage? www.bestbitcoindealers.com, it seems like there are huge differences in price across exchanges. Nice that Exmo actually lets you cash out in Dollars as they always seem to have high prices

Thankyou for your reply

Are there any SpreadBetting brokers out there with Altcoin CFDs? Would this project work? I would have thought it would need a very brave market maker to get on board with such a volatile space... https://www.indiegogo.com/projects/alty-exchange-trade-bitcoin-alternatives-easily#/