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I suspect many winners had lives that were train-wrecks in the first place.
Pretty much as well. In psychology, it is taught that people seek normalcy, meaning what they are familiar with. If you artificially change their situation, they will unknowingly seek to return to what they once knew.
A new dimension to “when your number comes up”.
As you say, most are not prepared to deal with the intense pressure of wealth that they did not acquire over time. They never created the habits that created or stored wealth. So it is no surprise when the train comes off the tracks.