Currently DT is working hard to identify buying and selling accounts, so I think the existing system is good. Let the forum take care of all this
Do you know what DT is and which DT members are "working hard" on that problem? It used to be possible to buy and sell BTT accounts without any sanctions, then people started getting red tags only if they asked if it was possible to buy a BTT account, and today there are members who sell BTT accounts for months without having a single red tag from DT1 members. I would conclude that the majority simply do not care and do not want to spend their time on such things.
Yes, most likely that is the case now, seen some who still continue to sell accounts and they don't care if they are getting negative tag because it really doesn't have any effect on on them. And for most DT members, just a waste of time for them. And if one account is getting tag, comes 2 or even more accounts popping up to continue to sell.
The only solution is to outright ban account sellers, but as I have said, they will just create more accounts and willing to pay for it. And then continue what they've used to. And as long as there are account buyers, this sellers are going to stay here.