now on the flip side-
if the 'going rate' is $25/outlet, and you want to be competetive, so you charge the going rate.
you hire a mechanic who does great work. quality is super. your paying him that same $1800/weej, but he only does 90 outlets in a week. What do you do? Do you cut his pay? Even though he is doing great work? Do you take a loss every week?
Also, if a guy cuts corners because he is doing piecework, what makes you think he will suddenly have integrity if you are paying him hourly?