Isn't mod writers licensing tech from Bethesda in the same way Bethesda license tech from Gamebryo or other devs from other engines such as Unreal, cry engine etc? If yes, how much does Bethesda or other devs pay these engine companies?
Having said all that, at the end of the day mod users are using Bethesda tech and Bethesda should have the right demand however much payment they want for their tech. Whether thats fair or not is another question, After all Bethesda is not forcing mod writes to create mods for Skyrim, they can go and write mods for other games….
No it isn't similar, because Gamebryo have not already sold their product to every Bethesda customer. That is what you are missing. If we all had to buy Unreal Engine and Gamebryo before we could run games that use them, then those companies would be falling all over themseves to get developers such as Beshesda to make games for their platforms... And if they could then sell users extensions off the back of other developers work, they'd be laughing all the way to the bank and back.