Patty, I read your posts. (And I have been thinking of you, too!! Wondering how it went??)
Okay, back to the subject at hand: I have not done a careful study of this. But it's my impression that the posts that get the most comments are:
1. From frequent posters, meaning people who comment a lot on others' threads as well as post their own pics. It's only natural that we want to reciprocate.
2. From new posters. We try to be welcoming here!
3. From much-missed posters who haven't posted in a while. Because we miss them!
4. K/R, because we all know how helpful these can be.
I think Christie's also got a really good point about time of day. I know for me, posting (especially these days) is time related; I don't have time to dig back in the threads so I will post about the ones that catch my eye quickly when I take a short break at work.
There are also certain posters that I "follow" a bit more carefully, for want of a better word—either because I sense I can learn from them for some reason (body type similarities, similar aesthetic...or very DIFFERENT aesthetic, similar work-at-home lifestyle), or because they joined around the same time as I did and I feel we're on the journey together, or perhaps for some other reason.
I would like to keep up with everybody to the exact same degree, but it's not always possible. So as Jayne said, I'll sometimes not post if there are already a lot of comments and I don't have anything to add, and contrariwise, I'll make a special effort to post if it looks as if someone has got lost in the shuffle.