Donations. Why not add donations?
I have no problem buying things that are good. But this just seems weird to me. The standard for those mods - that you pay for - will have to be of such quality that I wouldn't be able to distinguish them from official stuff.
But hey, this is capitalism at its finest. I won't be buying shit. But there are sure to be people who will.
Edit: Kinda shitty of Valve and Bethesda to take 75% of what they sell the mod for though.
It's actually that last bit that worries me while also being shitty. This could just offload the work needed to do DLC while effectively getting paid like you made some. All kinds of annoying but otherwise ignorable stuff could be kept in place knowing paid mods will come around to address them. Things like Vinny's Bane (carry weight limitations) even if that specific example would probably be included in large mods or race to the bottom in pricing.