Some of those orders are from trading bots, or traders who just place orders just incase there is a huge dump and they don't have to miss out. The orders could also fake orders set by the exchange, so you really can't tell.
I agree with this statement. The cheap Buy Orders may be made by bots or people who expect for a huge dump. It can be done by traders or the exchange itself. Actually, it sometimes doesn't make sense to get the coins. They may set the rate orders for long term or just hope for the luck.