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Strongly agree with OP. After implement merit system people's are more encourage to buy account. And account farmer are getting this chance to sale account. Reference was posted 21 July 2014 whice is long time ago. That time wasn't merit system. But now merit system is implemented. I think this rule should be change to keep forum corruption free. It's hard to build an account now. So don't let spammer to buy account. If account seller and buyer baned by forum than no one will be encourage to do it.
I was also think similar , but OP has been posted

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Banning account trades in the forum might finish the deals happening in public, like in Auctions or Digital Goods sections, but they will start doing it in private like how they trade Merits right now, in Telegram groups or other places where the buyer contacts the seller and fix the deal and then picks up the supply from the forum.
At least it will stop trade account openly. Rule is too old. It should be change with timing. When officially will ban than people will not much encourage. Because if caught buyer/seller account will ban.
People can sell drugs elsewhere
Agree with it, although drugs can be sale elsewhere but it's not allowed by government's.