About 60 of those machines are custom L7 frontend load balancers, and an additional 40-50 are database and dev machines. As for the actual gameservers, that's about the numbers we expect on average (150/box), although it varies wildly by gametype. Simple games of Skywars or Murder Mystery with no AI and an ultra-slimmed-down world we can fit 300+ players per box and are CPU-bound. Housing or Skyblock servers with full AI, dynamic worlds, and player-built structures we might only be able to fit 100 players per box and are RAM-bound.

You're pretty accurate with the per player bandwidth. We measure it at an average of 200kbps/online player. We are incredibly compute-intensive, though, and these machines are all operating with E3-1271v3 CPUs, 32GB of RAM, and ~100GB SSD.