Rattler, if your auto mechanic is charging $32. per hour I can't imagine how he's surviving!
I sold my automotive repair business six years ago, and at that time our labor rate was over $60 per hour, and it was tough to manage even at that rate!
What a shop takes in from that labor rate has to cover wages, taxes, utilities, rent or mortgage, business insurance, worker's comp insurance, Elecronic diagnostic equipment with yearly updates, equipment and tools, nuts, bolts, fasteners, solvents, uniforms, mats, hazardous waste removal, fire safety systems, certification, education, building maintenance costs, Futa, Suta, Business Enterprise tax, Business earnings tax, and if there's anything left over perhaps an employee appreciation outing.
All things considered, I think you got a great deal from that marina.