This is the case for me too. But I did see one pop up ad one day. I can't remember what it was about. So far it's the only one i've seen.
I'd hate to see people abandon CF. This is the best regulated forum online in my opinion. (By regulated i mean mods and users make sure things stay organized, and well structured. Not too mention how friendly people are here.)
Hopefully something gets done.
The pop up ads should be all gone now.