I've seen Godaddy's advertisement once. I don't think I've seen any other on tv at all. I guess it would be something to try locally. The main reason someone might not try it, is due to the audience.

I mean.. how many people watching it, will honestly buy hosting? Unless every household had a website, it's not going to help much. Where as, if you sell a HOME product eg. vaccum, it will sell better, because almost ANY audience, would require a vaccum.