The more i think about this... do you think we could solve the issue just using exp? People cheat the system because the first two raids are significantly shorter and easier, thus making them a great deal more efficient for leveling. That sounds to me like they must be paying out too much. So lets cut the exp specifically for LotA and Syrcus by about 25-50%(and maybe reduce tomes). You can set WoD and Void Ark right about where the rewards are now. If the roulette sends you to either of the other two lvl 60 raids(weeping city or dun scaith) increase the exp by 25-50%(probly achieved most easily by adding a bonus - if you wanted to add bonus tomes as well i wouldnt argue). Then if the roulette sends you to one of the Ivalice raids the bonus can go up another 25-50%. The rewards for LotA and Syrcus would still be good for the time and effort required by those runs, but the increasing bonus for the harder runs would make people want them more(and hopefully avoid them less).