True 100BTC a day maybe but then their expenses may be 90BTC a day who knows are they transparent about their finances NO. You just don't know and because of that you have to take EXTRA EXTRA precautions with these exchanges. If they were more transparent if could verify their holdings something I would not be reducing my exposure right now.
Do not fall into the trap of guessing solvency since they are number 3 in volume it's meaningless unless you see the books. My procedures have saved my ass 3 times so far and really I forgot I did take a big hit on an exchange way way way back in the early days. Bitparking was the biggest namecoin exchange and I lost 50,000 NMC when it collapsed valued at the time 615 BTC and bitcoin price was at 200ish level. (Odd how I totally forgot about that!) So after that burn I never got burned again.
Cheers
Davinci