I never said they get paid twice what they are worth. I'm not prepared to evaluate a job group's value to society in general. I said that for many the pay is twice what would be paid for on civvy street.
I think much of what we have to deal with is the classification of jobs themselves. Take for example the warehousing field that we're talking about. An average supply technician worker-bee in the CF would be a corporal/mcpl who earns in the area of $5,088 to $5,516 per month (I'm assuming that sup tech isn't a specialist trade which would earn more). Consider as well that the job comes with a fairly generous benefits and pension package. On the other hand on civvy street a "warehouse worker" makes between
$2,478 to $3,094 per month and a "supply technician" makes between
$3,498 to $5,588 per month. What's interesting to note is that "supply technician" jobs are all in government employment while "warehouse worker" aren't. That said the military pay for a sup tech exceeds even that of a civilian one in that the range is much narrower and towards the upper end. Again, factor in the benefit programs of government workers especially the pension plans.
Whenever you look to salaries for "blue collar workers" across the country, you'll find that the salary ranges are below those of the average worker-bee salary of the CAF on the job floor. That's compounded by the fact that many of our lower level snr NCO roles are also included in the floor level management salaries that come within the civilian job range (let's face it, civvies do low level management different than the CAF - you'd be hard pressed to find a CWO position on civvy street without trying to shoehorn it into some executive level job or other). Once you do rise into more senior management jobs (both NCO and officer) things fluctuate wildly. Government lawyers for example are moderately placed while civilian lawyers earn anywhere from significantly lower starvation wages to obscenely higher wages as do most mid to high placed executives.
Admittedly the example isn't exactly twice, but this is an internet web site where some hyperbole is not only allowed but encouraged.