This might be a dumb question and maybe not the right forum, but there is a huge spread between MtGx and Coinbase. Any reason I couldn't transfer my BTC's from one to another to capitalize on that?
When you see a higher price between in exchanges, there's usually some liquidity issue at play there.
Also, note that the money transfer problem does not exist with Bitstamp or Coinbase, both of which are relatively easy to transfer money in and out of once you're verified.