Its not that we want the rewards at the end(well i admit i want them a bit :P ) but mostly we enjoy to see perfect cooperation of a human party against a powerfull enemy army 
So why not tie the bonds especially to the members of an alliance?
Well the idea is simple

As you all know the 3 continents are connected by a ship!
So it would be perfect to create another area like the Temple of balthazar called "Alliance Harbor" where each alliance has its personall harbor where they could build a ship for expedition...
Each ship needs materials(up to Anet the amount)+time to build (time to build up to Anet) and when its ready the alliance could launch 3-4 expeditions of 12 people beetween a 24hour scedule to a random area (Corsair lair etc). Same logic as Urgoz/ Deep but this will tie the team play and the Online Timming of many Alliance players

Any suggestions/opinions/feedback more than welcome

Lets evolve

"LoL is this have been proposed before sorry i am a newbie
"