^^^^ this, where the transport is really part of customer service
The pay may not necessarily have the highest bottom line, but when you divide the pay by the hours worked, the average hourly rate can be quite an eye opener.
Judehamish is quite right about the cars paying well, i did it for years and enjoyed it mostly, but you earn every penny and then some on most pay schemes.
This thread really needs subsections.
Easiest job
Most enjoyable job
Best paying job
Most complicated/skilled/hard job
Nice place to work, decent attitude etc.