synfresh: ... That's what's going to happen here. ...
At least for me personally I can say that I can very well resist Steam. The total number of games I own on Steam is exactly one. So if I say that I won't buy paid mods on Steam - at least I won't.
Gnostic: Don't insult DLC because DLC are suppose to work every time the game is updated. DLC is suppose to work with each other and won't break the game if all of them is installed together.
That's surely nice to have but the word DLC alone is pretty generic and could stand for everything as it is. And who says that mods are not fullfilling all these conditions. I think that indeed one could see them as kind of DLC - freelance, semi-professional DLC with slightly lower quality standards.
One should surely expect a paid mod to work fine most of the times the game is updated and it would be nice if the paid mod would work together with all major other DLCs. I guess without it it might not find many paying customers.
SentinelWolf: How different has the derivative work has to be from the original to be considered something else?
Valve might even just go to the point of renaming and keep on selling it, this time without giving modders a cut. ...
Taking two mods and combining them in one might for example constitute a derivative work. So it might be very simple, although I don't think Valve will do that (in the next time) because that would probably cause an even bigger uproar, even if they are legally entitled to do so.
Of course as a mod creator I would never put my work on the Workshop with such bad conditions.