I don't ever grind exp. Being max level and stats is very low on my priority list. The exp I get is something I get in addition while striving towards another goal, so if you find me in 50/60 roulette, I am there for another reason. I'm not in SB, so I am capped at 60 atm, and right now I do the daily 50/60 roulette for tomes to gear up other jobs, and also gear to either desynth or glam, and the crafting mats in those dungeons are VERY valuable to me.

If I was in SB getting to the level 70 cap, this exp would come from the MSQ, instances involved, and beast tribes. I can't fathom a reason why I would go back to ARR/HW roulettes to level when my abilities and stats are reduced to those levels. If I was to grind exp, I would spam the highest dungeon I can do as I would want the biggest bang for my buck.