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.

The 12th round of the 2024 Motocross World Championship got under way in Lombok, Indonesia, on July 07, 2024. Jeffrey Herlings of the Netherlands won the round, and there are eight more to go. (Photo by IPA/Splash News and Pictures/Rex Features/Shutterstock)

Wimbledon champion Carlos Alcaraz is presented with the trophy by Catherine, Princess of Wales after he defeated Novak Djokovic in straight sets on Sunday, July 14, 2024. It was only Kate’s second public appearance this year following her cancer diagnosis. (Photo by Aaron Chown/PA Wire)

Australian surfer Sally Fitzgibbons rides a wave during the 2023 ISA World Surfing Games at the El Tunco beach in El Salvador on June 6, 2023. (Photo by Marvin Recinos/AFP Photo)

Germany's Darja Varfolomeev competes in the individual all-around final of the Olympic qualifier 40th FIG Rhythmic Gymnastics World Championships in Valencia on August 26, 2023. (Photo by Jose Jordan/AFP Photo)

Runners cross the Verrazano-Narrows Bridge shortly after the start of the New York City Marathon in New York, November 2, 2014. (Photo by Lucas Jackson/Reuters)

UEFA staff member carry away the trophy from the pitch prior the UEFA Champions League semi-final football match between Leipzig and Paris Saint-Germain at the Luz stadium in Lisbon on August 18, 2020. (Photo by David Ramos/Pool via AFP Photo)

Gold medalist Shelly-Ann Fraser-Pryce of Jamaica celebrates after the Women's 100m Final during the 18th edition of the World Athletics Championships at Hayward Field in Eugene, Oregon, United States on July 17, 2022. (Photo by Aleksandra Szmigiel/Reuters)