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.

Model and Kate Moss lookalike, Denise Ohnona debuts a bespoke duvet-inspired dress designed by Travelodge, which they have dubbed “The 24-hour dress”, in London in the second decade of September 2024. (Photo by David Parry/PA Media Assignments)

John Cox, far left, begins his recall campaign for California governor with “Tag”, a Kodiak brown bear, on Tuesday, May 4, 2021 in Sacramento. It was the first stop for his “Meet the Beast” bus tour. (Photo by Renee C. Byer/The Sacramento Bee via AP Photo)

Drone view of vehicles after part of the ceiling collapsed in a mall in Osasco, Brazil on March 9, 2023. (Photo by Carla Carniel/Reuters)

American media personality and YouTuber Emma Chamberlain poses for photographers upon arrival at the Vogue World event on Sunday, June 23, 2024 in Paris. (Photo by Vianney Le Caer/Invision/AP Photo)

Hundreds of people from a range of NGOs and campaign groups protest to demand the immediate restoration of nature at DEFRA – Department for Environment Food & Rural Affairs on September 28, 2023 in London, England. The 2023 State of Nature Report revealed that approximately one in six species in Great Britain, including turtle doves and hazel dormice, are at risk of extinction, citing climate change, intensive farming, and pollution as major threats, with a 19% average decline in monitored plant and animal populations since 1970. (Photo by Guy Smallman/Getty Images)

Crowds watch surfers as the first big swell of the year arrives in Nazaré, Portugal on October 28, 2015. (Photo by Pedro Miranda/Demotix/Corbis)

Britain's Chris Froome, wearing the overall leader's yellow jersey, is followed by Spain's Alberto Losada, Italy's Vincenzo Nibali and Spain's Alejandro Valverde as they speed downhill during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)