This is why I've been saying Stamp isn't a real competitor to Gox. Stamp simply doesn't have the bid depth. You can't sell large quantities without causing lots of slippage.
stamps has been known to be slightly more volatile than gox
A natural consequence of laughable depth.
It's a lot better than it was a couple months ago at least, it will grow as more people give it a chance and stop staring and laughing at the depth thinking it will improve on its own. Gox had worse depth a year ago.