I think it's totally justified to leave a negative trust it's been known for the accounts to be sold and then later use that reputation to scam. I think people selling accounts with positive trust are the ones to really look out for though.
And this is exactly what op has done.
I repeat again, this is a question for clearing to every bitcointalk users that trading their accounts is legal or illegal and do not concern mine in anyway!
You sure about that. I remember you being caught and reported for farming a load of accounts in the 777 giveaway thread using bots a while back. Looking at them now many look to have negative feedback and have been shilling for crapcoin ICOs:
https://bitcointalk.org/index.php?action=profile;u=455033 Twisto February 23, 2015, 03:36:01 AM
https://bitcointalk.org/index.php?action=profile;u=455031 BitLoard February 23, 2015, 03:34:32 AM
https://bitcointalk.org/index.php?action=profile;u=457072 Silverstar February 24, 2015, 12:52:54 PM
https://bitcointalk.org/index.php?action=profile;u=492173 bombding March 24, 2015, 07:15:30 PM
https://bitcointalk.org/index.php?action=profile;u=492177 givedusty March 24, 2015, 07:20:29 PM
https://bitcointalk.org/index.php?action=profile;u=492178 jimpix March 24, 2015, 07:21:26 PM
https://bitcointalk.org/index.php?action=profile;u=492180 NeliFur March 24, 2015, 07:22:39 PM
https://bitcointalk.org/index.php?action=profile;u=506784 NeedsMoreJPEG April 16, 2015, 09:00:53 PM
https://bitcointalk.org/index.php?action=profile;u=506785 HolyBananas April 16, 2015, 09:01:50 PM
https://bitcointalk.org/index.php?action=profile;u=454846 MrLucas February 23, 2015, 12:46:29 AM
https://bitcointalk.org/index.php?action=profile;u=454844 Daniel_Th February 23, 2015, 12:45:27 AM
https://bitcointalk.org/index.php?action=profile;u=454839 waterpilem February 23, 2015, 12:42:01 AM
https://bitcointalk.org/index.php?action=profile;u=454843 AbrahamLinco February 23, 2015, 12:44:41 AM
https://bitcointalk.org/index.php?action=profile;u=454852 kamale February 23, 2015, 12:51:53 AM
https://bitcointalk.org/index.php?action=profile;u=455600 Th3Program February 23, 2015, 01:01:10 PM
https://bitcointalk.org/index.php?action=profile;u=455601 ElmedoRator February 23, 2015, 01:01:56 PM
https://bitcointalk.org/index.php?action=profile;u=455604 EgyKing February 23, 2015, 01:02:43 PM
https://bitcointalk.org/index.php?action=profile;u=455612 SeNeor February 23, 2015, 01:16:53 PM
https://bitcointalk.org/index.php?action=profile;u=455613 GladuCame February 23, 2015, 01:17:45 PM
https://bitcointalk.org/index.php?action=profile;u=455614 TalkinGbad February 23, 2015, 01:19:12 PM
https://bitcointalk.org/index.php?action=profile;u=455615 DonTsTop February 23, 2015, 01:20:14 PM
https://bitcointalk.org/index.php?action=profile;u=455618 WhyNot? February 23, 2015, 01:21:05 PM
https://bitcointalk.org/index.php?action=profile;u=492171 JoeBriggs March 24, 2015, 07:13:03 PM
https://bitcointalk.org/index.php?action=profile;u=492172 HobbitMud March 24, 2015, 07:13:56 PM
https://bitcointalk.org/index.php?action=profile;u=457081 BitKonquer February 24, 2015, 12:58:42 PM
https://bitcointalk.org/index.php?action=profile;u=457089 SuperSnic February 24, 2015, 01:03:25 PM
https://bitcointalk.org/index.php?action=profile;u=457159 TankGuard February 24, 2015, 02:14:58 PM
https://bitcointalk.org/index.php?action=profile;u=457164 $Darkloard$ February 24, 2015, 02:17:44 PM
https://bitcointalk.org/index.php?action=profile;u=457167 TopGun February 24, 2015, 02:19:24 PM
https://bitcointalk.org/index.php?action=profile;u=455038 NightDream February 23, 2015, 03:39:39 AM
https://bitcointalk.org/index.php?action=profile;u=455041 TheeBoss February 23, 2015, 03:40:40 AM
https://bitcointalk.org/index.php?action=profile;u=455044 Th3developer February 23, 2015, 03:42:25 AM
https://bitcointalk.org/index.php?action=profile;u=455047 The3max February 23, 2015, 03:43:18 AM
https://bitcointalk.org/index.php?action=profile;u=455048 Jetpower February 23, 2015, 03:44:35 AM
https://bitcointalk.org/index.php?action=profile;u=455049 IIlustor February 23, 2015, 03:45:21 AM
So, are you the scammer or are you just selling accounts to them? And no, it's not against the rules to sell accounts, but this is exactly why it's frowned upon.