my biggest concern is that the workshop for skyrim is not curated, meaning there is absolutely no quality control for mods. And given that bethesda games are buggy and broken, there is a very good chance your paid mod to not work and/or break your game. The 24 hr refund window is not enough for any proper play testing.
What about mod piracy? Valve only leaves that to the community to police. That is not enough.
I'm glad valve take this down because it has too many problems, it won't work.