"As Seen on...!"

i understand that advertising is the science of the immoral, and for that matter, more often than not, the science of the stupid.  but really....don't you love the 'as seen on television' ads that keep popping up in magazines and on the internet?  they must work, b/c the ads keep appearing.  but is anyone really convinced that a product is worthy because it's been advertised on a different medium? i guess....