http://www.bethblog.com/2015/04/27/why-were-trying-paid-skyr…
After discussion with Valve, and listening to our community, paid mods are being removed from Steam Workshop. Even though we had the best intentions, the feedback has been clear – this is not a feature you want. Your support means everything to us, and we hear you.
Hats off Tips fedora to Bethesda for this one.
Haven't played it for ages now but I only bought Skyrim on steam for the workshop and was annoyed to see that they had monetized it. I found it surprising though that even a good deal of the modders themselves were against charging for their work.