Proving that not every billionaire is terribly bright, Carl Icahn once again displays his failure to comprehend why it might be better for Apple (and its investors) for the company to hold onto the majority of its investments. Apparently he assumes that if they were to pour those assets into buying back stock that it would increase the price per share, and therefore the value of his own holdings. Superficially, that makes sense, but if you credit Apple management with being clever about how they've invested all those billions, and you should, then maybe not.