Do People Sometimes Do Persistent Groups?

[bodenn]

I have a 4 person static group. We had a 3 man and leveled them to 50. Then we started over to add a 4th person. We play almost every weekend and dont level those toons if someone cant play. The catch is we all know each other outside of the game.
I have tried starting static groups in the past but someone always cant wait and out levels the rest.