The salary they pay is double the median for car mechanics. You still think that's not paying enough?
Effectively you will either do the repair in the timeframe set by somebody from a desk, or you are not getting the 6 figure.
And I can already see pencil pushers making limits tighter when too many people would be able to fit in them. So only way to win is not play.
It's not up to me to decide if a given employer does or does not pay enough. If people don't want to work for your company, then you're not paying enough relative to your expectations around the job. That's not anyone's opinion, it's just how prices work.