Sometimes, for some people, betting on conventional sports is simply too easy or too boring. Any fan can make a prediction as to which team is going to win a basketball match, or which player is going to score next in a soccer match. It takes thought and tactical analysis to get it right, but often taking a punt might not be the worst idea.
Some people like to challenge themselves and place bets on sports that are so crazy and alternative that many people would never guess that they can even be wagered on. Some sports fans take it seriously while some just want some good, light-hearted fun with their friends to see who can make the most money on a ridiculous bet.