"His cuts cost more than ours...."
He has more hair than you do, he doesn't sit nicely in a chair and he has fangs.
You pay for what you get. If you don't want to pay as much, invest in a clippers, some scissors, toenail clippers, shampoo, a grooming table, a professional dryer (a decent one starts at $300) and do it yourself.
The groomer has to pay for their facility, their employee and all the materials, plus make a living.