I kind of agree with you. I used to place bet on hockey as here in Canada, hockey is #1 sport. The thign with hockey if that the #1 team in the league could play a game agains'nt the worst team in the league, and the best team will lose 5-0. It happens regularly pretty much every night. There is no sure thing in hockey. As in Football, usually, if Denver are playing jacksonville, there is no way that Jacksonville will win 40-0. usually (not always), the best team wins.
Same thing could be said in soccer ..... A soccer game can oftenly end 1-0 ... so let's say a really bad team are just lucky to score one goal from far away agains't the best team in the league, the game could easily end this way.
IMO footbal is probably the easiest team sport to bet and make money on