I tried but doesn't seem to work, it would make a somewhat useless category useful if you can gain this info.

I have seen on some forums where you can rate a poster by their login name when it appears as a post

Lately there has been quite a few scams going around althogh I have been very fortunate on this site but I must addmit I am getting somewhat paranoid to deal with members who haven't been around for a long time.