> First, I suspect most mega-rich find investing in all conditions far more enjoyable than anything that money might be able to buy.
Um, why would you suspect that? Do you find investing just to be investing more enjoyable than anything money could buy? Why would the mega-rich be any different?
> Third, it's not like buying an expensive auto collection is wasted money. That money will be used to build the infrastructure of those companies.
What I had in mind was an antique auto collection of the sort featured in reddit a few days ago. Buying a warehouse full of deusenbergs, corvairs, the taxi from seinfeld and a batmobile doesn't really "build the infrastructure of those companies" Anyway, by that logic wouldn't all consumption be beneficial? Going on a round-the-world cruise builds the infrastucture of the cruise company, right? Heck, pay a prostitute enough and she might buy a house with the income - that also "builds infrastructure"...