There is nothing like steady winning in gambling, gambling is based on luck, and mind you the risk in gambling is 50-50 either you win or loose...
Why do you keep repeating the 50/50 stuff?
Gambling is not just betting on black or red, let's say you don't bet on colors, you bet on numbers, so you place a bet on 7 out of 36 numbers are your chances still 50/50 Of course not!
I don't think that there are even 0.1% of sports events that have a 50/50 chance on the bet, so why keep this percentage?
You have 1/4, 1/100, 10/11, and even 1 in a million chances depending on what you gamble!