That's cool, but just to put how brutal Vegas odds are in context.
Let's say each of these bets is roughly a 50/50 proposition. It's essentially taking your $5 and for the first win, multiplying it by 2 to get to $10. Multiply that $10 by 2 and you get $20.
Multiply the original $5 X 2 on your calculator 15 straight times, which is the equivalent of this bet.
You get a total of $163,800.
The ticket paid out $100,000, $63,800 less than actually winning 15 straight bets from your original $5, provided there were no fees/vigs to bet.
Not that we wouldn't all be thrilled with $100,000, but parlays have huge costs paid to the house. They actually take a bigger chunk out of each individual win than in straight up betting and winning 15 in a row, doubling your money each time. It's kind of like investment fees and how that 3% annual management fee kills you in the long run, whereas if you'd just straight up invested in the S&P, you'd double your money in like half the time due to that 3% annual setback.
You'd get a much better payoff if you played blackjack or roulette and doubled your money 15 straight times. I don't have time to do the math, but there are significantly better odds, unless of course you think this person wasn't just lucky and can consistently beat the books (I don't.)