Okay I read through the last two pages of this thread, I'm gonna come in and give my opinion:
I... actually don't have any concrete reason to sprite. I'm usually not making any games, or comics, or taking any commissions, and I've pretty much given up on art as anything more than a hobby. I have difficulty seeing a picture as a 'picture' and not as just a detached group of objects, and I'm not sure if this is a behavior I could get over that would vastly improve my art or if it's something that's just part of the asperger's diagnosis and I'll never un-learn it.
In any case, I make art because it's fun for me. I like expressing the ideas in my head, showing people "hey, this is the Pokemon I thought up the other day". I find the process of pixel and sometimes even digital art soothing, there's something almost therapeutic about pixel-pushing and seeing the finished product is always fun. It's great to look at something and say "I made this".
I used to post only to show off; I was really reluctant to criticism. I would get angry at even the nicest, most constructive critique of my work. And tell you the truth, sometimes I still do, but it usually only happens when the person critiquing says shit like "the shading seems OFF" but doesn't tell me why. But I try to listen to what people say and take it to heart, even if I'm tired of looking at one sprite I'll try to attempt something else that fixes the previous sprite's problems.
I post on forums like TSR because I like showing people my work, and I like my art to be the best stuff I can make at that point in time. I post WIPs because I like them to be my best work when they're done. I post "finished" things because sometimes I don't think they measure up to my own standards. I like to look at a finished piece and be proud of myself because I did everything in my power to make something that meets or even exceeds my own expectations of my skill level.
I guess what I'm trying to say is that not everyone is a super serious artist, not everyone is here to "improve their craft". But that doesn't give them an excuse to flip out if they're being criticized. If they want their art to be fawned over and nothing else they should go to deviantArt or Youtube or something. TSR's sprite forum is a place that's for criticism, and anyone who goes to even one or two topics here should realize that.
Everyone has their own reason to post here. We shouldn't turn away anyone that seeks criticism, but we should make it crystal-clear that if you post here you are going to get c+c whether you like it or not.
(an aside: I notice a lot of criticism given to new members is a LOT more nasty than that given to regulars. I know harsh concrit is a hallmark of our forums, but we should be equally mean to everyone, right?
)