Liquidity, although Virtex is a lot better than it used to be. It wasn't long ago that if you wanted to buy $1000 worth of Bitcoins, you'd end getting 50 or 60 for the going rate and the rest would be way over-priced.
wasn't that true for MtGox CAD$ too?
Virtex has always had more volume then mtgox CAD, so wouldn't them mean Liquidity has always been better on Virtex
i think MtGox's CAD is hurting the Canadian bitcoin market.