The OP was about benchmarking. I just pointed out that my direct costs are fixed, and why they are fixed.
The issue isn't subs vs. employees. Each have pros and cons. For me, the pros of using subs outweigh the cons. But that is me and my company, and it wouldn't work for everyone.
What it really comes down to, in my situation, is that I handle the sales and marketing for a bunch of different subs/ painters. Using subs frees me from worrying about a lot of the production side issues. For example, I don't have to worry about equipment-- the subs handle that. So if their spray rig breaks, they fix it.
I set standards. I spec the job. It is their responsibility to meet those standards and follow those specs. How they do it is up to them.
This isn't to say that someone couldn't do the same thing with employees. They could. I just don't care to deal with a lot of the production issues if I don't have to. It is my way of delegating those responsibilities. There are certainly other ways to accomplish the same thing.
I do have payroll for myself and an office manager. But my biggest expense--direct costs-- is controlled and fixed. That frees me to focus on other things, like marketing, sales, writing, and plotting to take over the universe

.
Again, the OP was about benchmarking. I just wanted to set the context for my answer.
Brian Phillips