Banning the account transaction will only make this kind of transaction to operate from underground which makes the transaction hard to be tracked. By not banning the selling or buying of the forum account this actually have more benefit since all the sales of the account will be made in public
By outlawing armed robberies, we only force armed robbers to "operate from underground which makes the [armed robberies] hard to be tracked."
Something like that?
Besides, who would want to track upstanding citizens dealing in forum accounts???
armed robberies has been outlawed and yet it keeps on happening
, main point is, banning the account sales wont actually make this practice stop . Admin might want to track it perhaps the account is purchase by a serial scammer, imo @chronicsky: You're an account farmer, the cancer of bitcointalk. Just an opinion 
Umm, he is more likely an account trader not farmer and not a cancer
"TerminatorXL" is certainly not your main account and the only conclusion I can draw from that is: you are afraid to have your trolling associated with it. Which is - apart from the trolling bit - another good reasons why its fine to have multiple accounts.
Or afraid that his main account might be tagged with the negative trust for constant trolling