Market forces are what cause different jobs to pay different amounts. Welders don't get paid high wages out of charity or respect, they get it because welders with sufficient skills are rare, so if you don't pay up you won't get your welding done.
If service jobs can be differentiated (e.g. by training and licensing) then scarcity can be created.
For best results buy a political or ten and then enjoy the profit of having government violence chase away much of the "maybe not just as good but good enough for a lot of the demand that's out there" competition that doesn't have your training or license or belong to your professional group or whatever.
And the best part is the public pays for the privilege of having supply be constrained because the state forces that constrain it are not paid by those who benefit but by the taxpayer.
If service jobs can be differentiated (e.g. by training and licensing) then scarcity can be created.