If you think that even the heavily populated servers for Star Wars: The Old Republic seem a little bare, BioWare agrees with you. The developer is currently working on new tech to allow more gamers on a single server, which would, in turn, allow them to save money by optimizing server space.
BioWare is currently testing initiatives the studio calls “high-population server tech”, and that once the tech is perfected, any PC’s on an “origin” server will be moved to a new high population server.
This will also be useful when the MMO goes free-to-play, and the non-paying unwashed invade the game in droves later this year.