There isn’t any value really to having a reputation system, since in Rotmg there are so many scammers, they would just build up rep and then scam even easier, because people would put trust in that reputation - “omg i got scammed by a person with 200405 reputation this system is broken”.
And then complaints would go in to Deca quoting RealmEye reputation, making RE seem part of the problem - if I was RE I would stay far far away from being involved anything like this.
The simple system that exists now with multiwindow being marked (to show it is an impossible trade in 1 action) and scammer tag which acts to suppress offers when multiple people are reporting scams, is enough, IMO, and puts the emphasis on the person doing the trade to be happy with it.
I would be okay with a wider range of personal tags to use: (good trader, idiot, other, etc) to allow us to make our own personal lists, but that’s as far as I’d go.