Those tags don't mean anything to almost anyone and even your system can't be relied on to mean anything. Learn to deal with each person based on actions and forget those stupid badges. I think they should remove them altogether.
Example: Matthew N. Wright has been here for two years and... well... figure it out for yourself. He has almost 6,000 posts - looks like he's deleting because it used to be more.
Chaang Noi has been here for a year and a half and would like to be a scammer but isn't quite bright enough to make it work. I wouldn't buy an apple from him if he married my sister.
Vladimir has been here well over two years and ran his own competing forum where everyone had to drink tea and say cheerio and kiss each others ass or they would be banned. He went on a tirade once posting some shit in all his old posts about how bad this forum was and he would never return because of forum security or some shit. He is a Con Man extraordinaire and has 3500 posts.
MPOE-PR has been here almost a year and a half and is an obnoxious bitchy old drag queen. He has 3500 posts.
Nefario was here since December of 2010, used to be a mod and ran Bitcoins first bond exchange and is now labeled a scammer and left in disgrace.
Phinnaeus Gage has been here for two years and talks about fucking goats in just about every other thread he posts in and has 12,000+ posts. (Love you Bruno
)
The list goes on and on but the point is deal with each person individually. Don't look at their labels - look at their actions. No amount of labels, badges or tags are going to keep stupid people from being scammed. Also, protect yourself and use #bitcoin-otc and the OTC web of trust. It's not perfect but it works damn well for weeding out the bad eggs.