As long as luck is on your side, you will not have a hard time winning in sports betting, even if that parlay has a high payout.
But Vaculin, luck is never on the side of the player. You know that from the number of outcomes coming out to be winning and being known popularly. 
Rarely people win big win and jackpots. Sports is different though. You need to have a good understanding of the game, the teams and the environment where its played.
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Sometimes I go against my analysis as I believe oddsmaker are smart enough to fool us through their line, that's why there's always a saying in gambling that the public always lose because the public decides based on their emotion than on their mind.
Obviously they are going to fool the player. Thats their job and how they make money. The majority bet wins in many cases but some matches will be fixed or the team will be reluctant to go beyond a draw. Specially happens in local league games of smaller countries. 