bendover:
However, I've made comments where I've never received one thank you from the author.
Don't forget that some authors aren't even members here, and others may be inactive, gone on to other pursuits, or even deceased. Therefore, an author may never see your comment. Fortunately, comments aren't just for the author! Many people read them because it helps them decide which story to read. Many of my comments are addressed to the prospective reader more than to the author.
However, if you really like receiving "thank you" notes, then send lots of comments to that Guy Spencer fellow. I hear he responds to very nearly 100% of his comments.

Guy