Of course there is something about it. Here's a simple explanation. I am good with basketball since I grow up watching it rather than the football or soccer, I know every team, their skills and abilities and I know the other team as well, with my knowledge on both team and familiarity on both I could easily decide or predict what could be the outcome rather than placing bet on the soccer which I don't have any idea who are the players and the capability of the team vs the other team. See that?