It's commonsensical to assume that a sold account will be used nefariously. There's also no guarantee it won't be put in a mason jar & become a beautiful work of art. But I'd rather risk infringing on the freedoms of one budding artiste than live in a wasteland of [99% predictable] scam.
Sorry for the tangent/rant, just nurturing my inner Nazi. Don't hate, tolerate

no its not.
most people i see use it for sig-campaigns or promoting altcoins (thats what my old hero account did). and as long as they post useful stuff i am ok with it (in the spirit of:
http://xkcd.com/810/)
you say precrime is bad: i think the same.
but: forbidding account selling sounds like law & order to me.
if there is no victim: why judge?
governments also tend to forbid things people might use nefariously and i am strictly against it.
i dont have a problem with your inner nazi

IMHO tolerance is the most important thing between people (because all are different). why dont just tolerate account buying

(btw [a little out of context] imagine a really(!) poor family.. if they can make a few dollars from a sig campaign they might be able to send their kids to school... and what they think about btc then should be obvious)