These things I know. WoW server reimplementations are pretty monolithic and that causes a lot of problems on heavy loads. I know of a private server that's work

These things I know. WoW server reimplementations are pretty monolithic and that causes a lot of problems on heavy loads. I know of a private server that's working on having some "load balancing" to avoid that. What I mean by this is that currently the only way to have lots of players playing at once in the same realm is to buy very expensive hardware. That plus the amount of DoS attacks you receive if you are popular means that having a private WoW server online is anything but cheap.