Yeah ikr? This is the first I've seen it happening, but from from what I saw during the many debates about this last week, apparently this isn't a new thing and quite a few modding communities for games like Fallout, for example, have had people trying to charge actual money to download mods.
While new, original materials you really did create are yours to sell... but yeah indeed. I'm not going to have sympathy for someone who would try to skirt the NEW part and charge for modded stuff.