Why would the owners and players know? It would be certain players, or officials moving the game to a conclusion that fixes the game. Multi millionaire players, go broke all the time and need green. Rookies just starting out, then add into the mix that the majority of players are black and underpriviliged, likely raised by single moms. They have been exposed to crime and corruption since they was babes. Someone will be caught, it will be covered as a single incident, but players are doing it.
A player for the Atlanta Falcons name Calvin Ridley was a Pro Bowl caliber WR, he was suspended for the last 2 years for gambling for a couple of thousand dollars.
Given how many people are on the field for games, makes it almost impossible to affect the outcome of a game, a QB could but they make on the average 30 million per year.
Officials could affect the outcome, but they are under constant scrutiny and reviewed every play of every game, if someone was trying to cheat it would be them, it would be extremely difficult.
The one area that could change the outcome of a game is injury information or gameplan information released to people before the game and that would be really hard to catch.