Here are the reason why people should keep grinding reaper XP:
1. ????? NO Idea
End of reasons...........
Seriously though, Reaper has been Live on DDO for over 4.5 years now..........PLEASE add cosmetics for Points: 100, 125, 150, 175, 200 Etc Etc.
Also, because you (DDO) did not put a cap on Reaper XP, my suggestion would be to let people get some kind of benefit from getting reaper points beyond 156 Points, like 4HP per point above 156 points (these points ONLY apply to characters level 31+).