About getting rid of the scammers... Well, i once read something about discrimination that has something relevant.
Company A doesn't hires a genius softwareprogrammer because he's black. The porgrammer then gets hired by Company B. Eventually, Company B will push Company A out of the market because of superior staff.
Now, what to do? Easy. Whenever someone masses "I'm selling 10 diamonds!" tell him "i would watch out for <scammer who is online>, if i were you i wouldn't trade with him/her." Eventually, these scammers get so sick about not being able to trade, that they probably first try to become "good". Or quit the game
