Not only with sportsgambling but to all gambling games. Reason? Winning is never certain therefore playing more often would expose you to higher risk. Even if you happened to won big, it'll eventually be turned into loss; you won't win always. Higher exposure means higher risk unless you are lucky enough. Analysis would work indeed in sportsbetting but as we all know, anything could happen within a match. Even underdogs has chances to win and if you would be too greedy of winning because you have a lowe odd bet, then be prepared to suffer big time as well once the unexpected happens. We are all prone to greed and frustration.