I'm seeing plenty of people bragging that they cashed a ticket on the Giants to win the Super Bowl at odds of 40-1, or sometimes even worse. Congratulations, you won a lot less than you could have.
Without too much effort, you could have found the following money lines on the Giants to win each game along the way:
vs. NE: +430
Had you invested $100 in a futures ticket at the start of the playoffs at 40-1, you cashed $4100. Not bad. Had you parlayed that same $100, though:
$100 bet at +150 returns $250
$250 bet at +300 returns $1000
$1000 bet at +300 returns $4000
$4000 bet at +430 returns $21200
So your decision to bet the futures ticket instead of each game line ended up costing you a total of $17100. Nicely done.
By the way, this illustrates just how improbable the Giants' Super Bowl run was: if you believe the game lines were accurate, the Giants were a 200-1 underdog to do what they did.. They may not be the worst team to ever win the Super Bowl, but they're certainly the biggest underdog champions ever.