That $76 to $126 per shop hour is the range at most marinas around the lake. It's not how much per hour but how well the work is performed. All too often there is a lack of attention to detail. Work is rushed. Repairs or maintenance items are left incomplete or not done. Sometimes you just don't think you are getting what you paid for from the marina mechanics.
I would rather pay the higher rate and know that the work will be done properly and without causing other problems in the process.