So please answer the question, "Is it allowed to sell Bitcointalk account?"
You are Sr. member so i think definitely you know about it. But personally i hear about it mostly members are doing it and selling and purchasing, but no one have take any action on it. but i suggest you, avoid it and do your own work.
He definitely knows already the answer of his question unless if he bought that account directly to skip the newbie rank then for sure he would not know this thing thats why hes asking on this forum regarding to that matter, Selling accounts in this forum is allowed but it isnt tolerable and im not fan of it since these accounts could be used in scamming purposes.
Yep. That happened a lot in this forum or community when a scammer bought an account on as low as 0.05 or so and earned a quite large number of bitcoins by running a ponzi scheme with that trusted and senior account, because when new users see a senior account is the owner of that site they think it would probably be trusted so they invest and what happens at the end is known by all of us, Boooom! and gone.
Those scammers for sure uses that method to convince people here on forum to join on ponzi sites or any transactions that involves money. Mostly people fall always because they believe on high rank accounts especially newbies they easily fall to that thing. Thats why im not really fan on selling those higher rank accounts in this forum.