As one who did comment on your pic: I look at all the photography thumbs, and pick out the ones that shout at me. Your work did  that.
I am also aware that some folk are just starting maybe even with a first camera, and that some are children... so I also sometimes comment on pics that are not perfect, to encourage and help. 
Some comments I get are 'habit' comments, but I am always particularly thrilled to receive  them from folk who are skilled and talented. So I would value one or two from you.
RR is a club based on reciprocity, and as Fred255 points out you would draw more folks' attention to your work if you left a note, however brief, on some of theirs.

Sorry if this all sounds a bit too much, but a lifetime of teaching art has probably left its mark on me!
Andrea