Understand your concern completely. I've been in many plays where the large bid support just disappears and the stock drops to no bid fast. Those are 2-3 day pump and dumps. This has had consistently large bid support for 2 weeks now. Everytime someone dumps 20m+ shares, the large bid goes down a few ticks to force the seller out for less profit. Often times, real bids like this get completely sold into without the bid moving down and the stock drops back to no bid. This bidfoot is smart to drop the bid after big hits to avoid running out of ammo.