I personally would be very much willing to pay for an audit of an exchange before I make the choice of which exchange to use. As many other Bitcoin traders. Who else do you think?
There were no companies offering Bitcoin exchanges audit because the industry is very young. Expect those companies to appear (unless regulators start messing up with exchanges). If they don't appear, it means there's not enough demand. If there's no demand for audit and government is still trying to regulate the industry, it means they're wasting taxpayers money on something taxpayers don't want.
