"Because people will install apps that don't work and then blame their iP(ad|od|hone) for misbehaving. If they could figure out a good process for it, I'm sure

"Because people will install apps that don't work and then blame their iP(ad|od|hone) for misbehaving. If they could figure out a good process for it, I'm sure Apple would certify their developers before letting them develop applications." I don't buy that. What seems much more obvious a reason is that, they can't make money on selling applications outside the "AppStore"