I guess I am not a very smart man either. Because I do not understand what is going on here. The Op complains about the rust and is considering selling the car because of it.
1. What did you want when you were looking? Did you want a nice driver? Did you want a decent driver? Or did you want a project car?
2. Why did you buy a car with a medium amount of rust if you don't like rust?
3. You do realize that using a wire brush followed by "KBS Coat or Rust Bullet" is not fixing the rust. Slowing it down, perhaps, but not fixing it.
4. Also realize that there is always more rust than you can see. How carefully have you dug in to inspect for rust in places that could cause serious problems?
You were asked if you could do the rust repair yourself and did not answer. I assume you cannot.
I would sell it if I were you. It does not sound like you are motivated to properly fix the rust. It might be better to find a car with no rust.
