As I stated above, I have setup a small fee just to check if there is enough real interest for my work. Do you really believe that 1,00 � fee is actually selling?
Speaking generally, If I was a professional artist then I would make a site for selling sprites because there are no companies selling sprites. There is a gap in the market for this area. If you search the Internet for 3D models you can find thousands of them in any quality and for any purpose. Personally I didn't find a nice commercial site which is doing this job for 2D sprites .
Under this point of view, no I don't believe that selling sprites is overrated.
Thanks for sharing your thoughts.
EDIT: If you like my sprite just drop an e-mail and I will send the files without any charge. I would be happy to see my sprite in action in some of your creations