In Final Fantasy XI, instances (which required seals and such) provided a large reward which dropped maybe 1-6% of the time (like peacock charm). However, these instances also contained a chance to drop other items, crafting materials, scrolls, and gil. We need something similar to this in FFXIV. Even if the party failed to hit the jackpot, they still received other items which could be a great value and usually provided some sense of accomplishment (I.e. not dark matter).