It’s a numbers game and they have tons of fake profiles all over the Internet to be worrying about.
Especially, if someone flags them and has their account deleted, they have to create a whole new account.
Secondly just the concept of being paid to chat with others does not appeal to me, but that's just my opinion.
The old staple of online advertising comes in the form of banners.
Not that this is unreasonable because its not giving its a site that pays you.