Security expert Peter Wayner's new book Policing Online Games has been excerpted at GamaSutra, and the excerpted section deals with money. Interesting tidbits: He frames the problem as one of making sure that money is accounted to its rightful owners. In other words, he's working from an unstated assumption that property rights exist. Also, he seems unruffled at the idea that security is tough to do, asserting instead that hacking and duping and the rest can be controlled with the right systems. He's even unconcerned about security in peer to peer systems; his claim is that a central server architecture is not a necessary condition for ownership security. I suspect he makes everything seem much easier than it is.