Can't post it from my phone, or I'd link to TotalBiscuit's video on the subject.

The move definitely has its perks, but there are some really worrying aspects.

First, lack of quality control. You get no protection for what you buy. If you buy a mod and a future update breaks it, you are boned.

Second, lack of legal protection. Apparently there are already people pulling mods off sites and selling them as their own content. There's also the illegal state of mods based on third party IPs, such as the Skyrim LotR mod. They're qlready in questionable territory when free, and selling them is a strict no-no.

Finally, there's Valve's exploitation and extortion. We don't know what portion of the income goes to Valve and what goes to Bethesda, but the number we have, Valve withholding 75% of the profit, is complete BS, since it isn't their game, nor are they doing the mod work.

Valve is making a clear run at cornering the mod market. They already are running incredibly monopolistic practices in the PC gaming market. Giving them control of mods as well is NOT a good idea.