Why you thinking that the user should be banned from this forum? Trust page is not enough to warn people? He is already criticism several  times here and already tagged by multiple DT  members. Flag also supported by many reputed users. So why you decided to make deal with that guy? If you visit this scam accusations before making the deal you atleast don't lose your money.
And yes he must be banned if he do the crime of banning according to rules.