User blog comment:Timeoin/Creation Kit Update/@comment-4534710-20120204044837/@comment-30303790-20120206234514

Probably because the consoles have come to rely on game sales to be like fads, extremely popular and then left for "the new thing." Allowing the community to make and upload mods could keep gamers dedicated to a smaller amout of games for longer periods of time, and that makes less money.

But who knows, maybe one day...