One could argue that one of the main reasons why Skyrim is still relevant today is because mods were free and so accessible.
And you'd be right. Skyrim on the PC is only still big because everyone can mod it and turn the game into anything at all, and it's why people are still pumping out TOP 10 MODS OF THE WEEK(mods of the week) videos and getting hits. Trying to leech even more money out of the modding scene that's kept you relevant is pretty stupid. It's better to try and absorb the stuff you can, maybe officially support stuff, maybe do a contest or something... not try and sell them for a 75% cut. This backlash is exactly what it deserves, and I only hope it gets pointed at similar monetization schemes. Like the entirety of Dota.
I'm pretty surprised that you guys see it as a way to support themselves, because they get 25% of the sale and won't get that money until it's over 100 bucks. It's just another extension of The Hat Economy, where Valve, third party resellsers, and hangers on publishers make boatloads of money on stuff people add to the game out of their passion and investment. If ESO didn't kill that series, making modding another nickel and dime expense will signal the end of elder scrolls games.