I would not want to have something like 100 millions. I wouldn't know what to do with it. It would probably destroy my life. I'd want enough to maintain my current, familiar, modest, lifestyle with few minor improvement (like moving to a mild climate) and to be able to afford decent medical care, but without having to work. I would not want to change much in my life, get used to new things, etc.

Would that make me happy? Possibly. Money buys comfort and security and I lack both at the time.