Hi,
I'm probably not the best person to ask this question of, as I'm finding it hard enough to post words between work commitments, let alone pikkies, but here goes.
I don't post pikkies that often because my main motivation in taking photos is to gain enjoyment from the hobby. Hence, I only tend to post a pikkie if I think it's something out of the ordinary, or asking why it sucks so much (although I'd usually just delete in the latter case...). I don't otherwise feel the urge or obligation to share my photos: it's not that I don't want to share, it's just not a motivating factor.
Oh dear, I take photos but don't share that much. I don't think I'm going to burn in photography hell as a result, though - I share and contribute ideas and information when I can. Words have value too.
Regards,
Calx
PS - I don't critique other's pikkies very much because I don't think I'm a good critic.