Guild Wars 2

Well its very hard to get everyone to do a bounty because of the megaserver.
You must taxi people so be able to do it and this takes some time.
So why not add a guild party where only guild members can join, and since there are in one party it will be easier to get more people to do the bounty.
Simple as that.

We make 4-person parties for our guild missions. Then its really simple for one person to join party, taxi everyone over, then leave party and go to the next one.