Unnn .. not "why did you find it interesting", why would anybody do that in the first place?
I watched it all the way through, finding a peculiar pleasure in watching and listening to someone who obviouly loves going to a lot of trouble to do something apparently entirely pointless and who likes to share that pleasure with other people, never seeming to wonder who on earth could possibly be interested in such a non-hobby. There, I think, lies the charm: he is not preaching or looking for converts or trying to persuade you that sorting valueless coins will change your life and make you a better human being (or possibly a better ape, depending on your species) .... nope .... he's just sharing something he likes to do.
I have no idea why he likes doing it, but that's OK.
Excuse me, I have to get back to business now.
(Sorry?)
(Oh, what am I doing that's so important? Well, just routine stuff. I'm helping Tannin sort through his collection of photographs of the inside of obsolete computer components.)