Its a shame.  I do understand if you have real life problems preventing  you from staying in the group. For the others -  I  am not trying to convince anyone to change their mind, but I wish you didnt  take it that personally.  If  you do what you intended to do when you joined, you are in no way at fault for expectations of others.  I hesitated before I joint because I knew I wouldnt comment on all posted images, I knew I wouldnt post much and thus it wont be possible for others to 'get back at me' , and I said that clearly.  I still dont comment on everything and dont intend too. I really appreciate every one of the comments I get and I am very greatfull to those who do.  I take it all seriousely but by no means do I intend to incorporate all comments in my work.
I also still maintain there has to be some degree of mutuality, and if I absolutely never get comments from someone, sooner or later I will stop  commenting on theirs. I dont think that will be a problem, because bviousely we dont have that much in common:)
For all other members - if you get any helpfull feedback and can offer some feedback to others, please dont join the band-wagon.

"I paint that which comes from the imagination or from dreams, or from an unconscious drive. I photograph the things that I do not wish to paint, the things which already have an existence."
Man Ray, modernist painter
http://artpearl.redbubble.com/