I am in lvl 5 clan which is active but hasn't enough ppl on my lvl for RBP. So I look to find group for raid boss parties only.
My experiences with rbp assembled from random ppl shows those parties usually fail. Most ppl in such parties don't have a clue what to do and think you can kill lvl 55 rb the same way as you kill lvl 25 rb and most important are not accustomed to discipline and organization such RBP needs.
And of course this group/clan will get my help when it is needed even when I am not in their clan.
PS. I don't plan to change clans - I know I am too low lvl for the really big clans and the clan I am now is friendly and nice.