when you make a group of people you dont know, that may be acceptable, but people in your shell are supposed to be your friends, shows how much they care about you when you dont get invites
i have to dissagree with this. many many shells in FFXI as well as guilds in other MMOs are entirely focused on getting business done and thats it. then players go back to their social shells or alts.
im not saying this is true for everyone, but it is very prevalent.