I partially disagree with you. I've seen scammer (who have high rank and have some negative tags) add scam website on his signature and write non-spam post on board that doesn't show trust number. If those scammer are banned and forced to make new account, at least they can't use big-sized signature or attach image without additional effort (such as obtaining merit or spending money on copper member).
Yeah this is true but the fact is how many people can be ban effectively? let's not forget the fact that the trust system is not a 100% crystal.... Though scammers can be tagged negatively, sometimes genuine newbies that don't understand what the trust count means can fall victim of their schemes.
this scammer have four accounts.
Firstly I didn't bother opening the link. Users here will easily consider you an alt. If there is concrete evidence that a person breaks the forum rules resulting a ban penalty then eventually he'll be banned.