If I was filthy rich, i'd probably spend most of my life traveling the world. I wouldn't want a super big mansion, I'd just buy a 2 floor house with a couple of bedrooms and bathrooms and have a lot of property. I'd probably live up in the countryside. I'd also probably start a collection of something. Overall i'd probably just live a calm, simple life. I wouldn't be the kind of person that uses his money to get access to exclusive celebrity parties and all that type of stuff.
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Honestly? Live modestly and invest my money in things that I enjoy. I don't need a lot to be happy, so I'd probably wind up giving a lot of it away. I know that's the "no you really wouldn't" answer but I honestly can't think of anything worthwhile that I could spend that money on for myself.