Ive practiced and done all sorts of useless tricks and games, but this is one I still do not "get" in any way. What do people find satisfying or like about it? I could see doing it for a day to get alright at it, but much beyond that I don't really find it all that impressive shaving off fractions of a second. It doesn't even seem like a great party trick because you need special cups with holes in them so they don't stick.

But I guess it does build up atleast some level of hand-eye coordination and dexterity. Which is utterly lacking in most of today's youth and educational worlds where using actual tools and making things by hand is viewed as "dangerous" by many, and only a small fraction of kids get into many sports, and all of our focus is on more abstract concepts.