I had temp drafters, some were straight out of ITT Institute. They cost us $25/hr at that level of expertise, and some of them were very good at drafting, but most had had no exposure to the AIA standards for layer/level management. But they were perfect for incorporating redlines for record drawings quickly and cheaply. More experienced drafters (5 years or so in a production environment) were as much as $50 - $75, and we'd make permanent hires out of about half of those. It's a very good way to weed out the losers. But these people typically don't even know what a spreadsheet is, haven't sized pipes or equipment, need to be taught to think for themselves (not simply work from redlines), and usually have not done the same type of drafting (mech/piping, mech/HVAC, architectural, etc) for more than 6 months straight.
When I started with my last employer in '93, their policy was to not give engineers AutoCad, on the premise drafters were so much faster and more knowledgeable in the CAD standards. So even a minor correction/change had to go thru the redline/checkprint process. By the time I left, we all had it and were encouraged to make minor changes.