If I may suggest, it might be a good idea to let the users of your exchange know the depth of support available.  It might also be a good idea from a business point of view to ramp up your userbase slowly and make sure you have adequate infrastructure to support the user base.

Any new business is going to suffer growing pains.  Managing growth and the users expectations will be very important in terms of keeping them happy and feeling like they made a good choice in the selection of an exchange.

It is also apparent that the user loyalty is somewhat fragile in that it is realtively easy to utilize a different exchange.  Users can shift their bitcoin funds very easily between exchanges.  so it will be important to develop rapid feedback when users are not satisfied.

This may become a critical factor in the success of an Exchange, how well can you maintain the user satisfaction?

Some things users seems to appreciate:

Low cost of transactions
Security
Timely Information
Service updates?
Support

Bitcoin traders, feel free to add anything here that you want to see the Exchanges improve upon.