It's also worth remembering that although WoW, and EvE and Tabula Rasa and City of Heroes and yadda, yadda, yadda are connected to central servers and databases, the client and all the maths is kept local to your machine.
You don't run an MMO across the web, you just connect to the other players across the web. No different from VATSIM or any other online FS connection now.
You don't run an MMO across the web, you just connect to the other players across the web. No different from VATSIM or any other online FS connection now.