The more I think about this, the worse I feel about it.
YES, I want original content creators to be able to make money off their work - but modding is building on someone ELSE'S work.
There are several issues that could open a can of worms that could lead to the end of open-modding as we know it.
Whenever MONEY is attached to something fun and free, it tends to ruin it. In this case, we're talking about people making mods for games that are copyright protected.
What is the precedent for a modder to make money DIRECTLY off a game they do not own the intellectual rights to, nor do they have permission or a contract to make content for, much less PROFIT from? When it's made for FREE, it's no big deal. But when you start CHARGING for it, the rights' owners are probably going to want a cut themselves.
And Valve facilitating this and profiting from it as a 3rd party distributor kinda/sorta makes it a guaranteed target for legal problems.
---My biggest fear is that this will draw unwanted attention and scrutiny to the FREE modding community (...like the Iron Man/Hulk mods for various games) and even though no money is being made on the mods, the rights' owners will claim infringement anyway and shut EVERYTHING down.
Valve might want to rethink this. One of the big attractions to PC gaming is open-modding. If you jeopardize that, you have one less MAJOR reason to get into PC gaming in the first place.