Why BTC price is so low at Bittrex. Sometimes I see 400 - 500 $ difference between Bittrex and other exchanges. Arbitrage will be something but BTC is too slow this days that is why they make money on such a price difference.
Going back before seeing on the price of bitcoin on each exchanges does really vary on small spreads but now same as you said their difference is almost $400+ specially on bittrex when I do tried out to check the prices recently on bitcoin to those exchanges.I might think that I can do make money on doing arbitrage trading since spreads or gaps is too decent to make money but I'm not still sure to do such thing.
If the price is too low on an exchange, I automatically assume they are a scam trying to suck money away from users and stay away. there is no way that people will let such a huge profit opportunity develop. arbitrage traders will trade even a couple dollars difference between exchanges.