Much of that overhead is not going to admin salaries (although, as stated elsewhere in the discussion money is fungible) but covers things like the cost of buildings, labs, maintenance, etc.
I had no idea the on-going costs of physical things did not decrease over time, what an interesting thing to know. Here I thought that after you build the building and paid off the building, then for funsies also bought all the land surrounding the building, that at some point it would drastically cheaper to maintain it; but what you're saying makes so much sense!
