Playing the arbitrage game can be really challenging for sure. I've seen the same with with Vericoin. A Chinese Exchange had it sitting at 5x the value on the USD exchange but it was nearly impossible to sign up and get it sent over there to profit from. Closed exchanges or wallets preventing movement in and out... barriers to prevent arbitrage and a solid explanation for why certain coins can be more valuable on one exchange over another
RE: 3000% over night