User blog comment:Screwball86/Tapped-Out Imagination/@comment-1024726-20091228171404

Well, CP also has grey fish, fish, mullets, and lots of other resources... it also controls trade, so yes, it's quite valuable.

And yes, servers are digital copies of the island that exist all in the same place. However, they're kind of like they're in different dimensions, so they don't overlap with each other. Penguins can switch between servers, and different buildings can pop up in different servers.