It seems to me that a better approach would be to rank the posts directly, by giving a score of, say, 0 to 10. Then we can list the people who have the posts with the highest average, the highest scoring posts of all time and, even, take care of the inflating reputation problem.

Even the experience system could be modified to use the added benefit ranked posts would provide. Perhaps it might be interesting if, for a monk to progress past level x, it were necessary to have a minimum average score in the recent posts.