Personally, I skin because I enjoy it. I've always been a artist at heart and skinning gives me an outlet in that regard. Sure, download counts, appreciation and comments are nice perks. Some people do want download counts, some people want comments. I say, go for it, in anyway it makes you happy.
Adam, I know its difficult when people complain, but it is also nice to know that they like your work. Going back and updating older skins actually helps me to improve my work as a whole. Right now, I'm working on a totally new skin, but I really believe that updating my old skin is going to help me develop my skills better for the new skin.
What is really distracting though is that the old skins actually seem to get broken when new versions of the programs come out. But when I went back to really look at that broken skin, I realized it was crap. I just updated Silver Surfer, and I still believe its not quite complete. Whatever I do on my own time, I do to bring some satisfaction and happiness to my life or others. Not everything in life for me is about making money. For me it is developing myself as a person. Even writing and conversing with people on this messageboard helps me. And, its enjoyable when its also helps others.