Great info here, thanks. When I first joined up, I followed some people and then rapidly became bored with the rather shallow stuff they were churning out several times a day.
On the other hand, there are some posters who have the knack of posting several times a day and keeping every single one of them enertaining - and if they've already built up a following, that can work well.
But I can really see the importance of spending time on post promotion, especially for minnows.