One of the most famous bonsai collectors in Japan is a Golfer named, "Jumbo" something or other. He is a multimillionaire and an avid bonsai collector.
There's an English-language bonsai video out that shows just a few minutes in his garden. He's acknowledged "collector" though. He brings in the bonsai masters to work on his collection.
Then there was a mame collector named Zeko Nakamura, I think. He was a comedian/entertainer and had a couple hundred of these thumb sized micro-shohin. He would take them with him when he traveled.
He had a couple books out, "Bonsai Miniatures" among others, and had some parts in Akira Kurosawa movies
http://www.dvdpris.com/5457
Regards,
Matt