If I won some huge amount of money (like $150 million), I'd buy a giant tract of land, build the world's largest coaster (~430 feet tall, 100+ MPH, 10,000 feet long), and build my house on the property. From Intamin, that would probably cost around $50-75 million. Then, I'd have to hire maintenance guys, which would cost a lot, but if I sold tickets per ride during the summer (about 10 bucks a ride), and just made it a reservation type system, so you could ride 5 times max a day, and I'd allow around 10,000 rides per day. (reservation system) Hey, $100,000 a day would probably pay for the mechanics, ride ops and then some. I think enthusiasts and even some of the GP would pay 10 bucks and make a trip out to ride the world's first 400 foot coaster, don't you? Of course, the reservation system would be in place so I could reserve lots of off time, so I could ride it with my friends exclusively if I wanted to.
Or, to make it even more exotic, I'd make it personal, and only allow the GP to ride the ride during one week a year. Reservations need to be made in advance. It would be the legendary coaster!
Jman