The fact that mod's don't ban scamers makes them useless.
As for the proof here's a screen shot of the payment. http://postimg.org/image/pmctfn76r/ the who.is for the http://who.is/whois/http://toxcoin.com the site was created on December 30 2014, which should have been a red flag. I don't know if I want to take the time to completely find out who he is,
It is simple : the staff doesn't involve in any "scam accusation" they are not judges and this is a forum not a law court. If it seems a scam doesn't sign up, you should no trust no one.
Besides it's impossible to enforce. With the usage of VPN any ban can be bypassed. Effectively leaving trusted negative feedback on someone's profile almost bans that account from trading. OP if you want to prevent more people from being scammed you should share all the information you have of the scammer.
I've reported TXWA's new thread so it's moved to services and his negative trust can be seen immediately (it's on Beginners now where it's not shown unless his profile is opened).