Its solely that MM's see that they can sell shares they don't have and make money because of the large spreads. NITE showing 100 shares, he will probably sell 700-1200 shares before he moves up, and when he moves up the bid doesn't come up.....more money on top of more money. Thats why the BID is the key. PPP, TAD and a few others know this too. There needs to be 4 bids stacked up, all 1-2 pennies away from each other, pushing that BS ASK for 100 shares out of the way, and then KEEP raising the bids to drive the ASK up, THATS trading.
When the spread is a few cents, and when the bid is hit all the bids disappear, that means feeding-frenzy time for MM's. Not enough bidders. Traders play into that all day long. Buy at the bid. Thats always good advice.
