Arbitrage trading is a great way to profit especially in the crypro market. Looking at Coin Market Cap I've noticed the different prices for the same digital coin, which opens the door for some profits to be made. The average investor in this market already has at least 5 accounts on different exchanges to keep up with ICO's, certain cryptos and certain account benefits.
Being involved with different exchanges you can totally take advantage of trading when there's a big difference in price from one exchange to another. These drastic price differences are often seen with Bitcoin. Prices are based on supply and demand and in some countries like China, Nigeria, South Korea and Japan we've witnessed a big jump in the BTC value which at times has been double the BTC value in the US.
Arbitrage should be a big part of a day traders skill. These opportunities can bring big money and seem pretty common when it comes to Bitcoin.