You seem to hold the idea that users have some level of trustworthiness here and that the staff team should classify people as such. May I remind you that this is just a random place on the internet filled with people you don't know, who can easily fake their personality. No one here is 'trustworthy' and if you make the mistake of trading with someone you perceive as such then it's your fault if you get scammed.
The only thing the staff does is punish the people that do scam and now, with this method, is trying to prevent scamming in some cases.