Making FATE's a bit more interesting.

[Onnslaught]

FATE's don't need to give more rewards IMO. They are already far and away the best way to level (as far as speed goes). They are (as far as I know) the best way to get GC seals as well. People are flying through the levels grinding FATE quests. If you ask me they need to nerf FATE XP or seal gains. I realize you want some sort of incentive for endlessly grinding the same FATE quests but they already give plenty of rewards for doing so.

As far as making them more difficult or scaling with the amount of people that are doing the quest, I would be all for that. Having 50+ people hitting mobs that die so fast I can't even get a cast off is not my idea of fun.