Hmm ... the problem is that Bethesda were getting 45% ... which is absurd. I already paid for the game, the publisher should get at most 5-6% ... if the scheme was 10% valve, 10% bethesda, 80% mod creator - it would have been a different reaction.
I agree the percentage is ludicrous, but I don't find a small fee unreasonable at all. Developing a customizable system is hard. We may argue that they may sell extra copies based on that feature, but we'd never have objective data to back up or refute that claim.
But given the state of the existing mod communities, doing these things for free or donations and usually out of a love of the game, normalizing an environment where Bethesda gets money for doing no additional work is going to be understandably resisted.
Example:
If you rent a house and you have a party and make a meal, you are allowed to use the house to your fullest extent and eat as many meals as possible etc but the house is still owned by the landlord.
If you purchase a house and you have a party and make a meal, you have complete freedom and own the house outright.
Your meal is your mod and your house is Skyrim. They built the house and apparently think that they're just renting it to you even though you flat out purchased it from them.But they should not get more than the actual modder, imo.
Bethesda was already benefiting from the mods in the form of increased sales.