India cricket fans light firecrackers as they celebrate India winning the ICC Champions Trophy on a street in Varanasi, on March 9, 2025. India beat New Zealand by four wickets on March 9, 2025 in the one-day international (ODI) final to claim a record third Champions Trophy title. (Photo by Niharika Kulkarni/AFP Photo)

South Korean rapper Jennie performs at the Coachella Valley Music and Arts Festival in Indio, California, U.S., April 13, 2025. (Photo by Daniel Cole/Reuters)

A German fan cheers prior to the Group A match between Germany and Scotland at the Euro 2024 soccer tournament in Munich, Germany, Friday, June 14, 2024. (Photo by Antonio Calanni/AP Photo)

Ravers dance around Love Mobiles during the 22nd edition of the Lake Parade in Geneva, Switzerland, 20 July 2024. (Photo by Salvatore Di Nolfi/EPA/EFE)

(L-R) Jade Chapman, Maryam Maquillage, Mariah Carey, Laura Lee and Arika Sato attend M.A.C Cosmetics Mariah Carey Beauty Icon Launch at Baccarat Hotel on December 3, 2016 in New York City. (Photo by Theo Wargo/Getty Images for M.A.C)

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.

Front end detail of the Hyundai Santa Cruz crossover concept truck as it is displayed during the first press preview day of the North American International Auto Show in Detroit, Michigan January 12, 2015. (Photo by Rebecca Cook/Reuters)

This picture taken on January 25, 2015 shows a participant taking part in an ice water challenge in Zhangjiajie, central China's Hunan province. Participants were required to stay in an ice pond, holding an ice block while eating ice-cream with an electric fan blowing at them. (Photo by AFP Photo/Stringer)