I pay my labor manager $15/hr and labor $10/hr. It sounds like this a pretty constant with the rest of the posts in this thread. I would definitely pay somebody 20-25 if they could run the whole job and flag/spike fixtures off a diagram. This takes a ton of expirience and i dont see any of my guys doing this for the time being. Plus like billy said above I like being there and people hire me not some crew.
I feel like if someone else flagged my design I would need to go back and move a stuff 6" here and 1 foot here. It would drive me nuts. Best for the designer to flag for sure.
Regards