Still doesn't seem like an incredibly large investment for a company like CBS.
It does when it is an investment the company doesn't need to make. The episodes are HD ready. There's no reason to invest that kind of cash, especially into a product that has pretty limited appeal, like TAS. There's a reason it isn't syndicated as often as any of the live action series -- there just isn't demand from viewers. (Not to mention, there aren't that many episodes, which make it even more unappealing to buyers).