Jcustis wait until you find out about Second Life (http://secondlife.com/)

One thing I would say about the eBay, the video game dealer, etc... is that you have to stop thinking about brick and mortar stores. Physical location is totally unimportant. The broadband connection means the bad guy can be anywhere and still active and have "point" impact on your location. A warez server located in Chile can be used as an economic engine supporting illicit activities in Afghanistan and populated by users world wide. Recruitment for real world activities and preparation can occur in a virtual 3d terrain that can be modeled and built to EXACTLY duplicate an operation environment. Using tools like "Google Earth", and "Sketch Up" (impressive tools used to create the environment but not necessary) a 3d world can be built as a custom level in a game and used for on line training. Nobody here is going to mistake that kind of training for real world training but an adversary can also use that type of modeling to pass intel, show troop movements, create plans of attack, coordinate attacks, track patterns, and so much more.