Both the SecondMarket Trust and the ETF(will be) are audited. By 3rd parties.
These are non-concerns.
Why would you need to PAY an auditor to verify coins in a bitcoin address?
Are you serious? Why would you PAY an auditor to verify an SEC approved ETF that will share the same the same space as SPDR? I don't even know where to begin with that...
Like they would hold all the coins in one publicly viewable address?!

Anyway,
The Bitcoin Investment Trust is audited by Ersnt & Young.
http://en.wikipedia.org/wiki/Ernst_&_YoungDo at least some research.