Those who are experts in gambling would tell you that you're not guaranteed a 100% success rate no matter how skilled or how well you might cliam to have studied the game even though you're a sports Analyst or well informed in a particular sports, gambling has it risks and rewards and most times the risk is greater than the reward, I'll say it's on a ratio of 60:40 that's 60% loss compared to a 40% in winnings, most people newly introduced to sports betting have had several trials yielding losses before they attain jackpot, but it varies because some people are very lucky when it comes to gambling.
Should ambling have come with any guarantees, then we wouldn't have got the trade no more. You wouldn't find gambling sites out there as, the sportsbook or house can't keep loosing.
Your in business to profit right? If there were any guarantees for gamblers, it would be at the expense of the platform offering the game and that'll be a lose for them.
I don't know how you get to add a win to lose ratio to it but I don't think it's any close to accuracy what you've speculated and I feel it should be way less for wins even.