I think a couple reasons. 1. All the amazing screenshots in the bullshot thread, shich make Skyrim look mind blowing and also 2. The Steam holiday sale had Skyrim on sale for like $5. I just picked up a copy myself as a matter of fact (for the modability of it).
Question for you guys. I'm a newb at modding Skyrim. I've been tinkering though and get how it works at this point. Like a lot of other people I've been looking for that "perfect" ENB. As far as pure IQ/Performance goes, I really love the RealVision ENB. My only problem is that the colors are really oversaturated. it's like someone turned the color up to 11. Is there a way I can manually tone that aspect of the ENB down? 
Also, I keep seeing people mention the Somber ENB and I'd like to give it a try but it doesn't seem to be available on Nexus anymore. Is there somewhere else I can pick this mod up? If any of you wouldn't mind sharing some of the rarer mods with me, I would really love that. Unless there is some sort of secret repository with all the cool stuff or something that I'm missing, which in that case can you hook a brotha up with a link?!