I see that you already got your member status. Congratz. There're a banch of things that change: the amount of symbols in signature for example. Some bounty and signature campaignes allow only members to join. So it's worth it.
I still don't understand all the fuss about ranking up. Does having a signature line really make a difference?
I don't know, maybe it's because I don't really care, or understand, airdrops and signature campaigns.