MCX realized that its support system could not keep up with demand. It suspended trading and ensured all users were able to withdraw funds. Its creator is now actively working to improve the system, so that it can re-open and effectively meet demand.
Cryptsy has proven itself insecure, unstable, and unable to handle load. Its customer support is abysmal.
Ultimately: MCX chose to sacrifice revenue before sacrificing the experience and safety of its users; meanwhile Cryptsy lines its pockets with abandon.
I never thought I would reach this conclusion, but MCXNow looks like a class act in the Alt market world.