I don't really feel that it's necessary. I've always had far more Allied Notes than I could ever spend, even long after I stopped doing Campaign Battles. It all comes from Campaign Ops, which I do 7 of weekly, whenever possible. They are great experience for the low level jobs that you don't want to level, but want to have them leveled. :P I've got 17 jobs to 50+ (I want to get them all to 50 or higher to quest all the AF, just cuz I like doing AF quests, and quests in general), and many of them got leveled mainly through Campaign Ops and Miratete's Memoirs (from Secrets of Ovens Lost, Spice Gals, and Uninvited Guests, with the rare occasional Escort for Hire).
And now, with Instant Retrace scrolls lowered to 10 Allied Notes instead of 500... there's no way I could ever spend enough to lose Allied Notes. They just keep going up. XD
And to the above post: No, you can't say the same thing about CP/IS. The whole point of conquest is to kill *anything* that gives exp, because it gives your nation points to take over the region. And with Imperial Standing, as a mercenary you're taking care of the monster/beastmen populations since the army is too busy at war with the Far East to handle it themselves. :P