[ixnu]

Do you have data to support this claim?

It would certainly depend on location, but BLS average salary data seems to point otherwise:

Plumbers $49K: http://www.bls.gov/ooh/construction-and-extraction/plumbers-...

Electricians $49K: http://www.bls.gov/ooh/construction-and-extraction/electrici...

Mechanics $36K: http://www.bls.gov/ooh/installation-maintenance-and-repair/a...

Welders $36K: http://www.bls.gov/ooh/production/welders-cutters-solderers-...

-VS-

Software Developer $93K: http://www.bls.gov/ooh/computer-and-information-technology/s...

Computer Programer $74K: http://www.bls.gov/ooh/computer-and-information-technology/c...