I remember once when there was a record Powerball jackpot Mark Cuban said something to the effect - If you're a depressed or grumpy person before winning the lottery, you'll be like that after winning the lottery, too. I believe that would be true. Oh sure, the financial pressures would be gone and you could have free time and the best material possessions, but that computer between your two ears will still run the same software that it did before.
Forget the lottery. How many times does one say, "If I had _____, I would be happy." Then later in life you get ____ and it's okay for a while, but it's not the life-changing thing you imagined it would be.