just a joke....
okcoin's quality in chinese bitcoin exchange just above gbl,
No fee to a certain extent does increase the volume, but chinese users find their trading falsified data traces easily , and incorrigible.
if you chinese not poor you can see this:
http://xueqiu.com/4017847389/26702246 and more you can search in chinese about okcoin.
China is faking its volume since begin of trading, faking data has its tradition in china
I dont believe that volume from okcoin.. probably i would had believed from btcchina before they were shutdown for deposits but now.. indeed okcoin has good volume but thats alot