I played on this wonderful server before it went down and really enjoyed it at that time. While it was down I played on multiple other servers hosting the standard FTB modpacks and, after a bit they're all the same. Generic modpacks, generic people, lifeless rule mongering staff, etc.
Those other servers were just missing something to really keep you engaged, and i basically quit playing minecraft altogether.
Now I'm not sure exactly what it is about Preludegaming's servers that keep me coming back time and time again.
Could it be the excellent staff that interact with the community, and actively work to solve problems?
Could it be the custom modpack, with custom recipes?
Could it be the low lag server?
Maybe it's the excellent community full of users that enjoy tinkering with stuff to create new ways of doing things, while spending lots of time talking and making friends.
Not sure what it is exactly, but I'll play on PGN as long as it exists.