As far as salaries go... this can go several different ways.
As you can see with most ALL factory 8th scale pilots, most don't have a "package" deal. There's car, tires, fuel, engines, radio gear, etc. Sometimes, each individual company is part of that monthly salary that these guys get.
There's also the demographic as well. Where they're located also dictates a negotiating salary. If I had to guess, and this will be really close, that most paid guys don't make more than 40k a year as a base. It's all incentive based. You do well, you make more money... simple as that.