I tend not to comment on work that does not appeal to me in some way, be that compositionally, light/shadows, impressive landscape, style ETC. This often means that people who try to get return comments from me will just eventually ignore me and stop leaving comments on my photos, which is exactly what i want, i'm sure that leads some people to think of me as anti-social, but I'm not, i just can't be bothered to play silly games !
I also tend to avoid commenting on any persons work when i know they are one of those only after a 'return comment' because i just cant bring myself to say i love something when i don't. You find there are way too many people here who ignore you because you failed to comment on their last upload ? These people don't necessarily look through the gallery at photos, they look at names, which is not what it's supposed to be about.
I am not at all competitive about my photos, i am not after 24 comments and 6 favourites. I prefer it if people only comment if they truly like my upload and if not then either leave a decent crit or simply do not comment at all.. This is 'Renderosity', not 'Facebookerosity'.

And yes I'm sure people do leave Renderosity for these very reasons.

Kind regards.. Shaun