I enjoy seeing photos of quilts for inspiration on future projects to try. It is very helpful to get pattern names, tips on how it is constructed,etc. I often look, comment on those that really speak to me.
I post photos for the same reasons, to share, hopefully inspire a little spark of creativity, and share "how to's". Getting feedback is very encouraging too! But I don't expect everyone that looks to comment. And, I may be wrong on this, but I think anyone on the web can view threads, but can't comment unless they are registered on the Board----I guess I always thought that was the large difference between the 'viewed' and 'comments' numbers.