Just 300? I should get some screenshots of some of my records. My server is a "Day 1" server that should have it's population noted as "Overflowing! Get out!"
We're also waiting for the instance server upgrade to roll around our way. If your server is like mine, the "door boss" spawns starting around noon EDT and doesn't go away until sometimes 4am (leaving me at least a few hours to farm ZG for pets for my friends).