That is a terrible bet. We are talking about a best of 5 series then a best of 7 series. The chance of the better team winning a best of 5 series, even against the Padres, is nowhere near 75%. It would be hard to make them too much higher than even money, much less 75% vs the Astros or Braves, especially the Astros with that pitching. Bets like this are how these places make big money.