The answer to your question is that your premise is wrong. No one has spent any money hiding his birth certificate. That is a birther myth.
Neither of which change the fact his father was not a U.S. Citizen.
So if a long-form birth certificate wouldn't convince you he's eligible, why are you surprised that he won't release it?
Umm, with all the lawyers representing a case against Obama, Obama has NO lawyers defending HIM in court??