Netflix charge to watch too. When CBS, FOX etc offer an online feed or a "catch up" service it will come down to them either charging a monthly fee or plastering adverts all over it. Personally, I would prefer a monthly fee for the whole package or a pay-to-watch price for each show.
They did do this (Hulu Plus), and surprise, surprise, the greedy bastards chose to both charge a subscription AND continue to plaster ads everywhere.
It kind of reminds me of Nokia and digital photography. Their inability to abandon their current business model is destroying the massive advantage they have (had?) in terms of access to existing paying customers.
I think it's CBS who charges you for such a privilege. lol