I was saying to dh earlier that with that much (easy) money I would spend my life in guilt, thinking I should be helping x, y and z with my millions. Donating here there and everywhere.... and I would, believe me I would be soooo generous I would probably give most of it away. But there will always be people writing to you, pleading with you, and you would never know the truth from the fiction...
Your benefactor friends would always feel beholden to you. Friendships would break down. You would never know if people wanted you for you or your money. People would say they love you whatever but mutterings would still be muttered!
Dh said he'd be happier with a million... that way you could improve your life but realistically keep your winnings a secret.