A publisher is considering a book manuscript of mine, here's a relevant sample:
The only theoretical way to win is to do a serious amount of number crunching, find something that looks like an edge, blind spots that appear to offer value, and bet them when these situations present themselves.
Betting because you want to win money is a serious grind. If you can find a situation that favors you — meaning you’ve spotted something that happens a third of the time but you can get implied odds of 40 percent — you make that bet hundreds or even thousands of times, gradually building your bankroll.
Last year, in an 18-week NFL season, I made 32 bets and won 19 — 59 percent, a big win. The previous year, 54% — a little better than break even. The year before that, 50%, a loss. If you are attempting to put yourself through school, feed your kids or pay down your mortgage, this isn't going to do anything for you. It’s a long, long road, a place where you can double your bankroll in a month guessing well in soccer, and then lose half of those winnings on a big slate of Saturday games where you guess them all wrong.
It takes tremendous discipline to stick to the games you’ve identified as your best bets, and not waver from your commitment to playing only those games. It takes discipline to refuse to chase losses, and to refuse to take the bets you’re not 100 percent sure of after you’ve won a decent amount of money. It takes discipline to not raise the amount of your bet when things are going badly, and to not raise the amount of your bet when things are going well.
When people warn you about the importance of money management to being a successful bettor, they’re talking about the grind. The grind isn’t flashy. Big wins happen only occasionally. It’s more like a hundred small wins, all for exactly the same small amount, whether you felt going into the game that it was a sure thing or whether you felt it could go either way.
And if you win a hundred bets like that, it means you’ve also lost 85 bets, all for exactly the same small amount. Your edge is small, so your units must also be small. The common advice of having each bet be 1% to 2% of your bankroll is, if anything, aggressive. At some point, you’ll lose 15 or 20 bets in a row. Do you have enough to cover it? You have to have enough in your account to weather storms that you know are coming.