Further more to clarify without having to edit the original post too much. It was my understanding that Steemit's exchange treated all buy/sell orders as limit orders.

Similar to a stop loss they would trigger regardless of the price entered if someone tried to buy/sell at the price of the order 3 above the high/low it would trigger the lowest ask or highest buy first.

If this isn't the case? Well... The term "market manipulation" is the first to spring to mind.