They go broke for the exact same reason that 90% of people who win the lottery go broke with in 5 years of winning it. They were poor their whole life, waiting tables to put their two-year-old through college some day, and then one day they're suddenly multi-millionaires. They have more money than they know what to do with, so instead of investing it, they blow it all on dumb shit. Add to that, all their friends and relatives who haven't spoke to them in years, all the sudden need to "borrow" money. And the people are stupid enough to lend it to them, thinking they'll actually get it back one day.