Cardi B looking stylish as she leaves the Warner Music Grammy party in NYC on January 26, 2018. (Photo by Splash News and Pictures)

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.

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American actress Elle Fanning arrives for the 77th Tony Awards at Lincoln Center in New York on June 16, 2024. (Photo by Eduardo Munoz/Reuters)

American singer and dancer JoJo Siwa performs with her dancers during the Chicago Pride Fest on June 22, 2024 in Chicago, Illinois. (Photo by Barry Brecheisen/Getty Images)

US actress Vanessa Hudgens poses upon her arrival for the 25th annual Elton John AIDS Foundation's Academy Awards Viewing Party on February 26, 2017 in West Hollywood, California. (Photo by Tibrina Hobson/AFP Photo)

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Race-goers enjoy a drink during the “Ladies Day” at the Epsom Derby in Epsom Downs, Britain, 02 June 2023. The Epsom Derby Festival of horse racing takes place on 02 and 03 June 2023. (Photo by Neil Hall/EPA)