I don't think you know what a wall is. You can't just point at half of the entire order book of unrelated small orders and call that a wall.  A wall is a single vertical piece of the order book.  For example one single order for 5,000-30,000 coins or a few very close orders for 5,000 coins each.  You saw this frequently on gox. Occasionally they would stack like 50 orders for 500 btc each that were all 10 cents apart,  as if anyone was fooled by that.