I think someone staked out a sell at .51 as they could offer 2500 shares as opposed to offering 5000 at .50
Before you ask, I don't know why. Just obvious that less capital is committed for 2500 at .51 than 5000 at .50 given the order size required for a marketable order...
And we wait...
If I could afford to buy all of them, I would not need to buy any of them and I sure wouldn't be spending time on the message boards!