I don't know if this is a bug or intentional, but it seems rather exploit-y so I figured I would post it here. When you do guild tasks, you can turn one in to each guild, but it will give you SP to whichever job you have equipped at the time, not only the guild which is asking for the item. If you take one job around to all the guilds you can essentially get 500 SP every day from all 11 guilds on the same job.