Community made revenue

I know the map stamps go 100% to the map creators, but how much of a revenue share is there for item/taunt/effect creators? Do they get a portion of each key? Or do they get full revenue if it’s bought directly from the Mann co store?

I love the Halloween update and want to support the creators, but I don’t really want valve to profit blindly off of their minimal effort to keep the game running, especially given the yawn ongoing bot crisis.