I try to post 2-4 posts a day. Most of them go into some type of challenge or contest. Photos posts are short, ulogs are long. Others are in between. I have people who upvote my posts with their autovoters and if I don't post, I don't get the votes.
I often find that a short post I threw together quickly will get more interest in the comments than one I worked on for a long time. The photos I hesitate to post sometimes get tons of interest.
And then I do a lot of commenting like this, in places that interest me, and places that I might get upvotes for my comments. So I appreciate your short posts when I see them :)