Man, I go to the beach and miss such a wonderful shitstorm of activity.
So which side we on? Pro-horse armor or against horse armor?
Official DLC approved by the base-game's dev's - especially if they actually made it themselves - is fine.
I have no problem w/ pay-DLC, pay-Season Passes, and stuff of that stuff that's officially from the game's base-game creators. While item DLC's and copious amounts of meaningless DLC can be annoying - I can always avoid that crap and just go after the content I really want + need.
It's the 3rd party modder-made stuff for sale, where I say "NO!"
I think paid-mods will be way too much of a problem. While it would be nice for modders to be deserving of such compensation for their work + efforts (especially if they put a lot of their work assets, features, and stuff into it) - I think the problems of mod-stealing to sell another's work, even more crazy amounts of $-DLC to try to get up with (this makes it even more impossible than it often already is even w/ official DLC's), and other things can cause a-whole-nother crap-storm entirely. Looks like it already has, as well.
This is the problem w/ making $-mods like it is - b/c it's like the Wild Wild West out there, letting almost anyone sell a mod for a game w/ little to no control from the base-game dev's. It's not like the base-game dev's are being extremely selective here and picking very few great-mods to be sold there. It's not like BethSoft said, "That Nehrim mod for Oblivion - yep, that deserves to be one of the few official pay-mods for Oblivion."
If say the original-game dev's made a update to their base-game and a 3rd party mod you paid for is now broken - well, you're screwed. Enjoy your rental. It's not like Steam's friendly for rolling your game versions backwards or anything of the sort, so you can run an old mod. It also means, now the modder has to update their mod - if they want you to keep using it.
Also, one of the things I've always loved about mods - they are FREE. These are the afterlife for many games, to keep them going well after the game's original + official lifespan. I don't need to sink more $ to get more content - I can just go find it and experiment, seeing what fits my wants + needs.