So $5 would be $10. This makes it so every game is bettable. This is just who you think will win. To avoid this make the tiebreaker either whoever gets closest to picking the finals score, or the total amount of points scored. Normally you would just give them back whatever they put in and nothing more. If they win by exactly 3 points then it is a push. How this works is a team will be favored by a certain amount of point. Like we know an NFL team would crush a college team and the spread was created so even if though a team is a major favorite you can still bet on the game. This is the prediciton on who vegas is choosing to win and by how many points. http://www.sportsoccer.biz
The two most common ways to bet are either straight up betting or betting against the spread. . So a Giants win or if they lose by only 2 it makes the person who picked the Giants win.
Straight up is easy. If the patriots win by more than 3 then whoever picks the patriots win. I think the patriots are favored by 3 points. You will have to pay double whatever they gave you. If you pick the winning team you win the bet.
You can also bet against the spread