Remember, labor is just another thing we buy and sell.
In other markets, like those for cars, there are specialists that focus on naming fixed, non-negotiable prices. What buffer is doing seems pretty similar.
Like I said, the market has lots of options for devs. I don't know if they're $50k off...when I said not all devs care about salary, I'm talking about the last 10%. I don't know anybody who ignores $50k.