All I would say is check what you are getting and not what you think you are getting.
I Joined and I get lots of "letters" from girls, but I decided to do start checking.
Check (1)
Any pictures you get in letters, save them to your disk and then open them and view the photo details, especially the date created. Most of the letters I received are from women who's photo's are from circa 2010, so they probably look nothing like they do on the site.
Check (2)
Take a sentence from their bio which you think would be unique, and put it in google with speech marks on either side. You may find they are on more than one site, and make money by getting people to contact them.
The sites are nothing more than money mills for the owners, I would imagine that very few of the girls on there are actually on it to get a partner, but they can make a good living from it.