But you didn't have to pay the rent and massive overheads on a huge dealership with various 4 poster ramps, official diagnosic equipment etc. so it probably would be a fair bit cheaper for you (or a backstreet garage)
To be honest when I look at the size, and amount of people employed at my local Porsche dealership I'm surprised their hourly rate isn't even higher than it is. It must cost a ridiculous amount to run a dealership.