I agree with you but it also depends on where you live on how much is charged.
It takes a lot of work for just a sporting clip, I groomed my Standard girl this morning and it took me about 2 hours to do everything including drying. When I had her is a puppy clip it would take about 3 hours and with a full show coat it took me two days. So yes its a lot of hard work and you should expect to pay a bit.