A very interesting topic! But to be honest with all the things said here, I'm begining to wonder whether its worth all the trouble for a few dosen sales. Is it really worth it?

To those who actually have sold games. Do you provide extra service to customers? I mean, when (or if) people write you about bugs or problems or perhaps even want money back for some reason, how do you respond to that?
For instance, cairnswm, your game was reviewed a while ago. Some of the reviewers mentioned a few (minor) problems, one of them about sound iirc. Did you make a patch for the problems mentioned in that review?