You don't think what? That there's not somebody selling 0.15 coins over and over, snailing the price downwards?
I can't believe several people just HAPPENED to have exactly 0.15 BTC.
Or am I missing something?
Well a few pools have a minimum payout of 0.1 so it could be people cashing out... at a really small amount... and that reason it probably just a clutch at small straw.