I don't mind $100 an hour for labor. What ticks me off is the fact that the mechanic still only gets $10 to $20 per hour and the rest goes to the shop. I therefore use mobile mechanics. They still charge $100 an hour but at least the worker gets the money.
What most people don't take into consideration is that a shop owner has to pay rent, utilities, insurance, taxes, permits, shop provided special tools, non-essential labor wages(parts guy, receptionist, service writer, detail guy, etc.), uniforms, and shop supplies.
18 years ago, when I quit the dealership in Arkansas, I was getting $20/hr.
Mobile guys still have to take a portion of that $100/hr to pay for truck, maintenance, business license fees, gas, accountant, etc. Independents are less likely to have special tools that are required for a proper repair in some instances. Also, for a lot of jobs, scheduling may be weather dependent.
The only advantage(and remember, I had my own shop for about 8 years)is not having to work for someone else.
Nothing against mobile guys, and for most coach related jobs I don't want to tackle myself I'll use them. Engine and chassis repairs, not so much.
Most dealerships are set up so the shop(hopefully)pays the fixed expenses. The profits come from the
liars, uh, salespeople in the front of the building.