Geez. The odd reasons people have are odder than the odd numbers.
If I clap at all I leave 50. Why? Because it adds to the person's "read time." That's the only reason. It makes them MONEY. If you clap less they earn less. I also read the comments even if I don't comment. WHY? It earns them MONEY! "READ TIME." Any amount of time you spend on their article is considered read time unless you actually do something stupid like get up and go take a shower.