Single clappers tend to be readers (DMY pointed that out to me), as opposed to writers/readers, and those single claps hold a lot of weight for me.

I wrote about my thoughts on the clap system, including an explanation of my personal scale of 0, 18 or 36, here about two years ago. https://medium.com/mind-talk/mediums-clap-system-amounts-to-a-vermiform-appendix-7587edb85a0a