Yes they should be punished most especially if there are evidences that prove that they did scam people. But mostly these scammers would run away right after they commit the crime and would not return back on this forum.
Yes you are right there, most of them run after taking the money and if they do come back they come with new identities
Indeed, it is happening here.
the question arises here is that how to avoid them in their first attempt to try to cheat.
I suggest that The Forum management bring some changes in registration policy.
Maybe go for sms verification to rigister here.