I agree with this too 100%. As a new member myself and just starting out in this hobby I think this would be just as important to members like me as it would be to the older members.
Jamie Liu appeared out of nowhere and started buying up a lot of watches. The fact that the M2M feedback system isn't functional makes no difference in this case - just as it doesn't in most cases of organised scamming.
One repeat offender opened a new account here, laid low for almost a year making only 'post whore' type posts then put into action his plan and scammed several people and several TDs in one swoop - similar to Jamie Lius MO, similar to many 'professional' scammers MO.
It's been said before, it's up to you, the members to check on who you are dealing with - you're very lucky that the Moderators here even get involved in transactions that have gone bad - go over the TRF and they won't want to even know how much money you got scammed out of.
Just because somebody is on the forum doesn't mean they are trustworthy, just because they are supporters doesn't mean they are trustworthy. Read through their previous posts, check their profile etc - decide for yourself if you want to deal with this person.