Jean Pierre Augustin falls out of the ring after being hit by Chris Arreola during a Premier Boxing Champions Heavyweight Bout at AT&T Stadium on March 16, 2019 in Arlington, Texas. (Photo by Tom Pennington/Getty Images)

Italian rider Eva Lechner competes in the women's elite race of the “Hotondcross” cyclocross, the competition's fourth stage of the DVV Trofee Cyclocross in Ronse, on December 14, 2019. (Photo by David Stockman/BELGA/AFP Photo)

Spain's rider Fermin Aldeguer, foreground, leads as Spains rider Manuel Gonzalez Simon falls during Moto2 class race of the MotoGP Malaysian Grand Prix at the Sepang International Circuit in Sepang, Malaysia Sunday, November 12, 2023. (Photo by Vincent Thian/AP Photo)

Everyone wants to get something for nothing - whether it's a lucky upgrade that means you can turn left when you get on a plane instead or heading off into the economy seats, or even getting a few extra features thrown in for free when you buy a new car.

As some of the sharpest businesses around, no-one understands this quite as well as casinos and that's why they all have a system that they call comps. It's short for "complimentary offers" and these are special treats specially designed to reward you for your loyalty to the casino in question. They're basically bonuses.

Women dressed as a rabbit and a fox, who pose for pictures with tourists, walk in central Kiev, Ukraine April 4, 2018. (Photo by Gleb Garanich/Reuters)

Two stallions confront each other at a horse fighting contest in Rongshui, China. More than 30 horses from surrounding regions took part in the traditional activity of the Lantern festival. (Photo by China Foto Press)

Nadezhda Sergeeva, of the Russian Olympic Committee, looks at her time in the women's monobob heat 4 at the 2022 Winter Olympics, Monday, February 14, 2022, in the Yanqing district of Beijing. (Photo by Pavel Golovkin/AP Photo)