Its a great way to host community content. A lot of the times when someone shared something on the UDK forums a year later someone else post asking for a re-upload because of hosting problems or whatever. There are also a lot of programmers who would like some art to mess with or use for prototyping and artist who could use or learn from projects/code others put up. I could care less about someone selling their stuff (reasonably priced/over priced, good/crappy) everybody got ta live, and you don’t have to buy it if you don’t wanna 
. (Though a lot crappy upload would be annoying). Bet you’ll see some pretty neat stuff up there from the community :D.