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CLEVELAND --The $500 millionjackpot has a lot of people dreaming, but the story of some lottery winners warn to be careful what you wish for.

Some winners' stories are good examples that money can't buy happiness, and the experts agree.

"I think Henry Ford said money doesn't change a person, it simply unmasks them," said Michael Boone, president of MWBoone & Associates.

They say money doesn't make the man. And some Lotto winners agree. Only about half of lottery winners are happier three years after hitting big, according to Michael Boone, whose Seattle firm advises big lotto winners.

So people have an opportunity to do all the things they dreamed about, sometimes those are good things and sometimes not," Boone said.

Around Christmas of 2002, Jack Whittaker, of West Virginia, had the only winning ticket i the $314 million lottery jackpot.

Two years later, his wife said that she wishes she had torn up the ticket. Their lives were in shambles.

Their 17-year-old granddaughter died after struggling with drug addiction. Whittaker himself was arrested twice for drunken driving.

Abraham Shakespeare, of Florida, was murdered after winning $31 million.

Then there's Amanda Clayton, a young mother who won $1 million in the Michigan lottery. She made headlines when she continued to collect food stamps.

She was found dead of an apparent drug overdose.

Are these winners unlucky or is there something more to it?

Psychologist Alduan Tartt says big payouts can isolate people and thrust them into a world of wealth that is foreign to them.

There's a funny thing about money and happiness that not everyone knows about.

"You win the lottery and spend a lot of money.What happens is, you get used to having a lot of money and spending a lot of money,"Tartt says."So what happens is, you actually have to spend more money to get the same level of happiness."

What about lottery winners who do end up happy?

Their secret, experts say, is that they don't lose their sense of self and they successfully separate their identity from their money.

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