My friends and I spent about 6 hours across 2 days working on Bane of Thorns. Considering that hard mode alone is difficult, making sure no one dies and doing it in less than 30 minutes is incredibly hard. And once we managed to snag Bane of Thorns a little something extra for our efforts would have been awesome. We didn't expect to get the page at all, but considering the increased hassle of doing a perfecta when a style page is dropping an extra reward would be an even greater incentive to get people to do the dungeon.