Right now you get "ancient member" status with just over 300 posts. There really should be higher rankings considering that some users have thousands of posts. Having them in ADOM monster style (greater mimic, master mimic etc.) would be extra fun:

0 posts= invisible stalker
1+ least member
10+ lesser member
25+ member
50+ greater member
100+ member chieftain
250+ master member
500+ member lord
1000+ member king
2500+ member emperor
5000+ ancient member