It comes with time and post count. I'm not quite sure about how active you have to be on the forums, besides the fact that you have to be active. I say this because even with my post count I was inactive for awhile and I was dropped from the high scores.
Concerning the post count, it hasn't and won't, to my knowledge, be released.
Edit:
http://highscores.rsbandb.com/runescape ... full_high_scores/faqQuote:
Why is my character not on this list?
These high scores are composed of people who enter their Runescape character(s) name in the RSN fields on the RSBandB forums. There are certain requirements for being active on the forums including length of membership, and activity on forums. The current requirements are:
* You must have been a member of the RSBandB community for at least one month
* You must have posted at least once in a forum with post count in the last month
* You must have logged in to or visited the forums within the past week
These requirements may change at anytime, as we only want active community members on this list, not people who just joined the community to be on the high scores and not participate within the community.
