I have to believe that you're acting like an ass!
IME unmounting/mounting a tire runs $15, so no, I don't think being able to unscrew a sensor a put a new one on is worth more than $10 (Add ~$10-20 for balancing I suppose, but I doubt it'll need it unless the new TPMS is drastically different compared to the old one). People get paid what the market will bear. If a company wants to charge $100/hour in labor and all the other companies do the same then that's what's gonna happen, but that doesn't make $100/hour reasonable.