What I haven’t seen mentioned on this thread is,
STEAM is awash with poor quality products, should valve chuck out the trash and leave a core of solid products ?
Would this make STEAM direct more appealing (for a fee at the higher end) … as you would be joining a quality Market Place?
Or how about filtering things out to a lower tier STEAM … STEAM community and Steam Pro ?
just my own musings
Paul G
Edit
I might add with upgrade / downgrade path
And possibly a max / min price range for each service… this could possibly control quality better than any high / low submission fee… you would have to be confident your product could sell at XXX -YYY price range.