Whether traded accounts are used for good or bad is down to your own personal opinion of what 'good' and 'bad' is.
Also, I disagree entirely with this statement. Life isn't a gray blur of moral ambiguity.
Good = truth = freedom = life
Bad = lies = imprisonment = death
So there you go. A lot of the time good and bad isn't a matter of personal opinion but is pretty clear cut. It seems to me that you ought to know lying is bad by now, and pretending to be somebody you are not is lying.
You are not pretending to be a specific identity. When you post on here you are posting from a username (under certain circumstances this can even be changed). When you make a post, you do not represent that you are any specific person.
Also when you sell your account, you would also be selling any kind of "identity" associated with such account and this should be obvious to anyone selling such account.
Monitoring is underway.
I'm collecting two lists, one of account sellers and the other of account buyers. I will be sure to post this information, links and dates so everybody can see who to avoid from now on.
https://bitcointalk.org/index.php?action=profile;u=358020