{betting} -

: In betting, there is no such thing as a "lock." Uncertainty is inherent, and even heavily favored outcomes can fail. Popular Types of Wagers My Year as a Degenerate Sports Gambler - The Atlantic

To understand how betting works, you must first grasp how bookmakers (the entities taking the bets) present information: {BETTING}

: Bookmakers include a profit margin in their odds, ensuring they have a mathematical advantage over time. Every bet typically has a "negative expectation," meaning the house expects to keep a percentage of all total wagers placed. : In betting, there is no such thing as a "lock