No, that's not what the money is for. The money compensates inventory, scheduling, and delivery risk. It does not compensate developers for working on mundane projects. If the developer in question gets a W2 paycheck, odds are they're not seeing anything like 4x what the in-house people are seeing.
And, while I do buy that all three of these developer archetypes exist in the real world, I do not buy that they are the reason that companies don't deploy talent aggressively to upgrade "support services". Rather, companies make straightforward buy-vs-build decisions based on whether projects are part of the focus of the business or not.