Can anyone shed some light on why there are extreme ARCA bids and asks on some stocks? For example, FDX closed at 49.99 today. There is an ARCA bid for 100 shares at .01 and an ARCA offer of 100 shares for $99.84. I see this on a huge number of stocks. It appears the offer is always double and the bid is always a penny or so. Are these guys hoping that they get filled accidentally because of a typing mistake or something? If that did happen, wouldn't the trade get busted anyway?