Use it to give people jobs. Open up restaurants and build schools and hospitals. Help friends start their own businesses, stimulate the economy. Tony Hseih, RIP, didn't have a private air force, but he made downtown Vegas. Someone's already started an electric car company, and built a rocket company to go to Mars, so that's been done, but there's just so much out there. Rhianna's got her clothing line for people who aren't models. Cars and houses are boring.