I wanted to add that it is, of course, entirely possible that there extraordinarily beautiful people out there who are online, and some who actually are models and are posting real pictures of themselves.
I had a friend in high school who modeled for local ads and another who was a local beauty pageant winner. Both of them hated the beauty industry though, and left to become, respectively, an attorney, and a youth missionary. And as you can imagine, neither one of them had to make up stories online to get attention (though neither one was the attention-seeking type at all.)
A long time ago, we had a young member here who said he was trying to break into modeling and his avatars were supposedly of him walking in fashion shows. He wasn't here very long, and I have no idea if it was really him.
I'm sure people like that are really out there--just not quite as "often" as most would like to think.