It's kind of fun watching the manipulator play with all of the traders like this. Talking about the bidwall as if it was real, and now that sell wall as if it's real.
If it wasn't for the fact that Bitfinex does leverage its order book chart would look identical to Bitstamp's. How much would it cost to put up a giant 20k wall like the buy wall that just got pulled?
It's entirely possible, and I'm not sure that it's been discussed to any length, that the bid (and ask?) wall(s) are predominantly borrowed money.