Yeah, because now you can charge people money for the privilege of playing other people's content that they are also now selling, AND get a piece of the money that those other people get as well.
It's like if Steam charged you a one-time fee to use it. Or Apple... wait, that's called buying an iPhone, n/m.
Plus you don't have to rush patches because other people will make the (unofficial) patches for you, and pay you to do it!
The funny thing is that absent mods, the whacky lore is the main thing Elder Scrolls has going for it, and I don't know if Skyrim would have been as popular among the masses if it was more like Morrowind in the world-building department.