This is for the other degenerate sports betters out there.
Free Bitcoin has some NFL games to bet on every week. I can't tell why they don't have them all. They also have monthly Bitcoin price bets.
The mechanism is similar to what I've discussed with @ekzyis, elsewhere: the site just pays out the pool of bets to the winners in proportion to how much they wagered. There is a neat wrinkle, where there's an odds boost for placing earlier bets.
Here are some hypothetical Week 7 bets I may or may not have made:
Saints L (odds=2.6)
Browns W (odds=1.4)
Ravens W (odds=1.7)
Pats W (odds=7.5)
Bucs L (odds=1.6)
Chiefs W (odds=1.3)
Dolphins L (odds=2)
Vikings W (odds=7)
Total ROI=2.35
This week (Week 8), here's who I may or may not be betting on:
Cowboys
Jaguars
Commies
Pats
49ers
Chiefs
Raiders