That leaves me with a 3.50 profit if you ignore the 100 frequent flier miles or $1.00 in cash back I get depending on which credit card I use. The bet closes when the 117th congress meets on Jan 3rd, so about 12% of a year away. That gets me an annualized return of 29%, or 37.5% if you count my $1 in cash back from my card. If I was just using funds I kept in my Predictit account to take advantage of these rubes over and over so I didn't really pay that 5% withdraw fee on every transaction it goes up to an annualized return in the 75% range. Keep in mind, we're talking about a time when people are willing to invest in the IB "notes" program for a .5% annualized return!