I agree with so much of what @asemaster wrote…
But both need an education in basic business. These operators need a ral course in Supply Side Economics with a Major Understanding of Supply and Demand…
You maximize profits by making the most your resources (space, workers, tools, equipment, etc…), ask the highest price that maximizes the use of your resources.
In the two examples, Shop A charges $60 and Shop B charges $30 for the service, (I know I’ll get kick back…) but assuming all resources being equal (technician’s skill, space, tools, equipment, etc…), shop A needs to lower the cost to attract more customers. Shop B (probably has more customers than they can handle) needs to raise their price. Both shops need to evaluate the work load, If A still has open bays, they lower their price again. If B still has cars waiting for service, they need to raise their price again…
Both shops keep doing this until (maybe $45 is the perfect price) all bays are full and all vehicles are serviced during the day.
Empty bays mean the shop is paying technicians to sit around. It costs money to run a shop even when no work is being performed and the Ancillary Costs of running a business… (salaries, mortgage/rent, electricity, taxes, insurance, water, sewage, trash, and so much more…) will sink the business. Shop A may think getting $60 for that one job is great, but the adjacent bays may be empty…
Customers who cannot get their vehicles serviced because Shop B is so busy that they will not return and they will not recommend you and your “Yelp” review will be yelping… Even though, your bays may be full, you will barely, if even breaking even with the Ancillary Costs of running a business (salaries, mortgage/rent, electricity, taxes, insurance, water, sewage, trash, and so much more…) exceed your income…
Running a business is Rocket Science if you want to maximize profits and offer the most employment with the best wages… Good wages attracts good people. You take care of the people and they will take care of you…
If you just want to play business, ask any price that will keep you afloat, but you will only make enough money to hire the least qualified, never be able to afford new or modern equipment, and your facilities will slowly deteriorate until you do not attract enough customers to even stay afloat.
I also know that a big shop in a busy metropolitan area will find it easier to apply these principals and a small shop in a small town will be very much economy driven… And in this case you will have to decide how many chickens you will take in trade for the service…