Do you really allow credit card purchases? If so, how's that been going?
How much do you charge above bitstamp? If it's low enough I might use you guys as a supplier when my usual BTC stock runs low.
Unfortunately we are no longer accepting credit card purchases at this time. It went ok while it lasted. We didn't like the payment processor we were working with.
In an effort to increase transparency, we have fixed our price to Bitstamp 24h high. This allows us to protect ourselves from volatility but also usually offer pretty competitive pricing.