Like BOR said, the general public eats this shit up and begs for more.
The problem is nobody wants to admit it. Nobody wants to admit that they dig watching Extra or reading the National Enquirer because it's considered a little low brow, but millions of people tune in and millions of people pick it up. There are dozens of celebrity gossip sites and celebrity 'news' has managed to infiltrate mainstream news programs.
If no one is drinking the Kool-Aid, why are there so many different flavors on the menu?
As to the OP...I visit all these sites. Sometimes I'm genuinely interested, sometimes I want to laugh, sometimes I'm bored out of my skull, but most times it's to check out those Hi-Res celebrity pictures because some of those celebrities are hot and deep down....I'm just a big ol' perv.