Businesses don't function to pay the employees as much as the owners. If you think a framing sub is paying people $50 an hour because $12k into 240 man hours is $50 an hour, then I don't know what to tell you... It's likely 4 of them are getting paid $18 and the owner is taking the rest in overhead and profit.Again depending on what you are calling a carpenter most framers and trim guys make that easy.
Let's say you have a 2000 sq ft house and the framers charge $4.50-6 a foot. They are getting 9000-12,000 for the job and typically knock that size project out in 5 days if the supplier is on point. That's a 4-6 man crew working and banking that in a week. Granted each guy may not make the same but if you average hours per guy I think you'll easily get over $50 an hour.
Plumbers and electricians get $85 an hour
In the same way framers avg more trim guys do the same as well.
I've seen quite a few certified payroll reports to substantiate this position.