Apple (so far) has been very reliable about letting you give them extra cash for a mostly user-respecting experience, and that's the main reason I buy from them (and has made me happy with my Apple TV purchase)
So as long as these built-in ads on the display can be disabled by disconnecting the thing from the internet, I can live with it. If they ever decide to make them work offline, or start embedding a cell antenna in the TV set, that's when I'll throw a real fit