And I really feel sorry for all bitcoin merchants like bitcoinstore and bitpay. They were operating blindly when mtgox was down for 12 hours, and took huge risk in the extremely volatile market.
BitcoinStore doesn't set the rate, their payment processor does.
- https://bitpay.com/bitcoin-exchange-rates
And they use a rate from multiple exchanges.
Just because it is difficult to move enough funds into Mt. Gox to meet the selling pressure doesn't mean the more favorable prices at other exchanges can't be utilized.
We are getting to the point that there is no longer just one marketplace that dictates what is the current bitcoin spot price