That would require more effort than convincing some girl who's attracted to you that she's your girlfriend and convincing her to whore herself out. Also, you can't just become a porn star or pimp by just being good looking, there are other requirements.
This was purely hypothetical, also I wouldn't actually consider her my girlfriend just a tool to make me money.
There's nothing cucked about cheating on your girlfriend while using her to make you more money and convincing her you love her, while soaking in her admiration and desire for you.