I don't buy that argument. If the plumber/electrician is working for a company and driving a company car, then the company will pay the extra $15 for that corporate vehicle to be in Manhattan.

If the person has their own business then they can easily afford the daily $15. Skilled trades and the owners of those companies make very good wages in NYC.

I see plenty of blue collar workers on the MTA. Its one of the fastest ways to get around Manhattan and much cheaper than paying for parking.