I get the most comments on my pages when I (a) journal especially if it's not the usual rainbows 'n' sprinkles kind and (b) scrap a baby. Imagine how many I would get if it was a 'deep' baby page!
I totally suck at commenting on people's work, though, so I don't get too worked up if I don't get any back. I assume that lots of scrappers are the same way I am and do driveby gallery-ing on a regular basis.
You know I really love you when I start leaving your random NSBR comments on your gallery (right, E?!) that have nothing whatsoever to do with the page. At that point, it feels silly to say 'great page' or 'neat colors' when I know all abt your life, where you vacationed last year, what your youngest is allergic to, etc., kwim? Then I just leave you lub.