wouldn't that be wonderful. every linkshell that has tried to be like that, all i EVER hear is:

is anyone partying in the dunes? can i join you?
i'm broke! someone help me!
how do i find this item?
i need help on limit break quests
i've been waiting forever and i still don't have a party invite!
someone help me unlock summoner/ninja/bard/dragoon/everythingelse
I'd love to help you with [some random endgame event or hnm]! i'm level 30
someone help me with rank missions.
etc etc

if you end up finding a good linkshell, that's friendly, helpful, and not full of annoying n00bs then i will be really jealous! good luck and don't give up till you find a good one!