I’m guessing because you have standards and want to be with someone who actually cares about you and who you care about and who you share interests with beyond a cheap fuck.
Unfortunately, loneliness is a huge problem in our society and you are one of the many people who suffer from it, but this asshole is just as lonely. He’s just filling the loneliness gap with something he might as well pay for considering how much it really means to him in terms of being with another person.