leves give 25k while azys FATEs give me about 58k+ or something
25k is only "basic" reward without extras. Generally you get about ~2.2 times more if you do levequest "quickly" and complete side objectives while you also get some extra loot comparing to FATEs. Also, if we're talking about 51+ stuff, Temple Leves (I mean ones that cost 10 allowances) give pretty nice chunk of exp for not too much of effort. Also, "saving" allowances for leveling non-battle classes not worth it if you're already sitting at 100 allowances and juts do nothing with them (and it's generally the thing with "saving" allowances, because leveling non-battle classes is pretty fast thing to do).

But I also agree that it would be great if we had some extra content in which we could level as efficiently as leves, FATEs and dungeons.