I think the volume mostly cycles through hte walls. In the same period btc-e perhaps has sole 300% of the total available supply of PPC.
Would people be buying if there wasn’t an available supply of liquidity that they could enter without further driving up the price of PPC, when the price trends up?
It’s also much easier to place a large buy order when huge liquidity walls are provided.
I can understand your arguement but my point is that it cuts both ways. The big liquidity will help huge buyers, too.