Yes, but then what about someone who's indecisive and starts it one forum, moves it to another, then changes their mind.
Or start in one forum, someone else says "It should be in the other sub-forum" it gets moved by the original poster, then someone else says "No it should be in the log-pile".
You'll just end up with tons of "Moved" threads littering the forum.
Limited administration/moderation is there for a good reason. As much as empowering people is desirable, its generally results in a complete mess.