i would suggest making an update schedule that members can see, something like:
"i update my member area every monday, wednesday, and something special for fridays!"
even if you have extra stuff to post, save it for those days. members like a stable routine. three times per week is plenty for your niche, and really posting something special on fridays works well (ie: video clips).
do you have a journal/blog? if so update that a little every day if you can, or at least every other day.
hope this helps. i've experimented on my own sites for years and this formula worked very well. keeping the "routine" aspect in play is the key, the "loyal fans" fit it into their personal lives and rely on it.
