Dude, I think that one day you maybe be become a pimp!
Have you ever think about finding a normal girlfriend or you don't like responsibilities? I can tell you from my personal experience, that people who practice sex as a pleasure, have problem with their character. Most of them are not sure what they want and there are others who are not prepare to love and respect them self enough.
I don't have nothing against what you are doing, but I am sure that you can think about this. Let me ask you something... What it's the difference between having a sex with a normal girl and having a sex with a prostitute? I think that both of them can give you the same pleasure, but with the normal girl you will feel that on a different way.