I don’t profit from RetroPie, I provide a service and people compensate me for it. I fully disclose that RetroPie is free to download. It’s just like someone paying to have an OS installed and configured on a desktop computer.
I’m sorry you feel that way and I am sorry to hijack OP’s thread, but there are people who want this who don’t have the time/ability/inclination to set it up themselves. They are choosing to pay someone to set it up for them and that is their prerogative.