I think the pricing of these is always difficult. There are a lot of factors to take into account. One being, what's going to win me the race a set of new tyres or a fancy shell paint job, in that sense the new tyres will literally win every time.
The other thing is these are TOY CARS I don't care what anyone says they're not scale models they're just expensive toys for those of us that don't like growing up, me included and I'm 40 next year
so because they're toy cars it's just a hobby to most of us and therefore probably can't afford to pay a fortune.
Other than that the hours it takes to do these is incredible, well for a lot of people I know, obviously there are the super quick overly talented types that bang many out a day but for me I can just do them at my own pace, it's not my job so I just charge some money. You can't equate a proper hourly rate to them, I think mine averages about a pound an hour when I've taken into account design time, marking out the shell and then the quickest part of the job the paint work.
So fair enough if you or others on here don't want to charge people much so be it, I guess we're all price conditioned by each other but none of us are charging enough.