[buzzin_]

There is an informational asymmetry, so rogue exchanges can lie all they want without you knowing for sure, and those that do not want to give you your money for whatever reason always do (lie that is).

This happened with MtGox and permanent withdrawal problems, both with USD and BTC.

With USD, it was "Oh, no, its the banks, they are limiting us to $50.000 per day, it's not us".

With BTC, it was "Oh, no, Bitcoin network has a bug, we cannot process withdrawals, it's not us".