Agreed! As to the value per clap, it is a question of who is clapping for your article and how much they clap for your article relative to their usual activity.
I’ve had single claps as high in value as $4 and as low as $.01. It just depends on the readers activity. The only other factor Medium considers is read time, but this is likely to prevent fraud more than a compensation mechanism.
If you want to delve a little more into claps/earnings, Blogging Guide has a number of articles:
Also, if you want to help increase transparency, while still remaining anonymous, I’ve been doing an anonymous monthly earnings survey, which is still open for September: