Female winner Ane Guro Moen at Hardangervidda Marathon on September 2, 2017 in Eidfjord, Norway. Hardangervidda Marathon goes through parts of the National Park of Hardangervidda, passing through glaciers and waterfalls. (Photo by Kai-Otto Melau/Getty Images)

A demonstrator wearing a face mask reading “Who gave the order?” looks on during a protest to mark the International Day for the Elimination of Violence against Women, in Bogota, Colombia on November 25, 2020. (Photo by Luisa Gonzalez/Reuters)

Nicki Minaj shows off to the crowd on top of a music truck during the Trinidad and Tobago Carnival in Port of Spain, Trinidad and Tobago, 26 February 2020. Minaj apologized on 26 February for her husband's behavior after a video showing Petty pushing a well-known local artist. The man had touched Minaj to allegedly encourage her in her performance. (Photo by Dexter Phillip via MoPho for London Entertainment/Splash News and Pictures)

A woman checks on two of her puppies after her neighborhood was evacuated because of severe flooding in Channelview, Texas, on Saturday, May 4, 2024. Days of rain caused rivers to swell, leaving homes and businesses flooded and thousands of people displaced. (Photo by Raquel Natalicchio/Houston Chronicle/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.

Police officers detain a Femen activist during a demonstration of supporters of former Spanish dictator Francisco Franco, during annual gathering held on the week of the 45th anniversary of the dictator's death, in Madrid, Spain, November 22, 2020. (Photo by Javier Barbancho/Reuters)

Platense's defender Ayrton Costa (L) and River Plate's defender Andres Herrera vie for the ball during the Argentine Professional Football League match at the Monumental stadium in Buenos Aires, on October 12, 2022. (Photo by Juan Mabromata/AFP Photo)