Thanks for everyone's input. To answer mrfixit I have two techs for now (may need to hire a 3rd come summer). I have one part-time fill-in-advisor/shuttle driver/gopher.
Other than that, I am doing it all; writing service, filing warranty claims, booking internals, etc. I was trying to come up with something that is fair for both the company and commensurate to the time I put in and functions that I perform.