Houbi Reaches 10Million BTC WEEKLY Volume - Is It Real?

This seems really strange: Houbi has reached all-time high volume. Weekly volume has reached 10 Million Bitcoins. Remember: Chinese exchanges have a 0% fee model, which enables interesting trading behavior.

To compare, this is what OKCoin weekly volume looks like:

And this is what BTCC (BTCChina) looks like, note the reverse trend of their Chinese competitors OKCoin/Houbi:

And now compare with the USD exchanges, here's Bitfinex's weekly chart with volume:

Looks a bit more normal. 

Now let's look at BitStamp, who has been suspected of volume faking also:

So it seems like Houbi's 10 million coin weekly volume is a bit suspicious in the context of how the rest of the exchanges are doing. But maybe they just have some special customers and are doing really well? Who knows.