Will the world ever find world peace?
Will the evil in people causing murder, illegal drugs, rape, wars, etc. ever stop?
Your joining a cheating forum, there is bound to be cheaters who don't play by the rules. NOT EVEN SYTHE RULES. The only way to protect yourself is to research, ask questions and be extremely cautious while conducting your business on Sythe.
Ok, just say Sythe did indeed implement your little system. This forum had something similar to iOffer's sellers account, where you would need to make a $20 deposit in order to sell.
Statistics:
-There are currently 173,811 members.
-10,000 members do decide to pay the $50.
-That's $500,000.00 right there.
Who would be in charge of this money? Certainly not one user. If a group of mods. shared an account with this money, who's to say a couple hundred dollars here or there won't go slipping without anybody noticing? Even if it was seen, this is one account, shared by a group of mods. The person who tried to steal some funds won't be known. The list of problems will never cease. Josh5498 is right.
Overview: If a scammer knew what he was doing and wanted to steal a Runescape account somebody was selling that contained rares+mills, $50 would be a small price for him. Indeed it might fish out the small time scammers, but it would also greatly impact the rest of the community as well. Case closed.
The End?