As we found out last time from @HugeOgre’s data collection thread, luck scrolls fluctuated between 5 and 7 for everyone between level 1 and 25. That small deviation is fair enough to me. However, heroism scrolls had a large deviation. Some guilds had 0 drop while another had 6.
Basically, they need to handle fireball and heroism scrolls the same way they do luck scrolls.