My reason for not joining (besides my first 3 MP games) is CBM (dont care for the number).
I find it interesting that the other two newbie games I play that got organisized (relativly fast) on this page are vanilla.
Honestly CBM looks like something for an old (dont want to say veteran
) player, who knows the game in and out and want some change for the sake of change alone.
For newbies who struggle to learn the basic game? I keep to vanilla until that gets stale, but since I found the game <2 months ago, that should'nt be in the near future.