mistermumbles: Even with that kind of money I wouldn't want anything that big. Excess for excess sake just seems silly to me. *shrug*
I would however buy the entire GOG catalog and a kick-ass gaming PC. ;)
I despise such excess and think it's a complete waste of space if he doesn't make such a party there every second day.
With so much money, I'd build a big workshop complex for instrument makers where I would gather all my colleagues, a concert location nearby, buy the best versions of all kinds of instruments for me and a this location, nice appartments on top for me, for those and potential families, would make some charitable foundations for musical education for the underclass, would buy private tutoring for my potential children so they don't have to take in all this bs in public and private schools, would make a record label for folk music, would buy some houses in Berlin and make the rent way lower than usual today so the natives could afford rent again too (currently they are misplaced due to the invasion of rich southern folk for years) etc... I'd have a lot of ideas on spending money without having to spend it on such stupid excess and buying myself into the rich social class and their stupid parties.
I'd pump a lot of money into strengthening Linux gaming too of course.
Invest in OpenGL, OpenSource, a dedicated gaming Linux distro if SteamOS turns out to be too much corporate controlled and spyware filled etc... encourage Linux ports.
And of course I'd buy the rest of the whole non-regionally priced part of the GoG-catalogue.