This is corroborated by other stories coming out of the intel community. AQ is apparently quite anal about their expense accounting.
It’s probably something that originated from Osama bin Ladin and the fact that he ran some family businesses, and his own. It probably reflects that they are very concerned about the money being used very specifically on the plans that they have. And it also reflects their acknowledgement that that have a limited amount of money and want to “get the most bang for their buck?” ... :-) ...