[_delirium]

I think he's a somewhat odd case, in that accumulating wealth, rather than the wealth itself, is what he finds interesting. He doesn't seem to have any particular desire to build huge mansions or leave a multi-generation legacy or anything, but really likes running Berkshire Hathaway. He did it well enough that he now has a huge pile of money that he doesn't really need or even particularly want, so now wants to find something useful to spend it on.