I haven't had a request for one of these in multiple years.  

I never said anything in them that wasn't already right in front of them on the tax return...yes I prepared the return for the past X years, yes the client filed a Sch C that was included with the tax return...I have no clue why this would help get the loan unless the bank thinks that its a forged return the client gave them, and they can still move forward without having to wait for the 4506 to be processed by IRS for verification of filing.