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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I'd probably try to start up some sort of company somehow that would find cures to horrible illnesses.