Edgar Sanchez stops on a walk with his dogs who cool off in a pool beside a fire hydrant sprayer, Saturday, June 22, 2024, in the Lower East Side neighborhood of New York. (Photo by John Minchillo/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.

A Kashmiri Muslim woman balances on a water pipe before collecting water at Dasilpora village on March 22, 2018. World Water Day is held annually on 22 March as a means of focusing attention on the importance of freshwater and advocating for the sustainable management of freshwater resources. (Photo by Tauseef Mustafa/AFP Photo)

People in funny costumes race down the slope in bathtubs during the 7th Bathtub race at Stoos, Switzerland, on January 19, 2019. (Photo by Urs Flueeler/EPA/EFE/Rex Features/Shutterstock)

Fans of the Kansas City Chiefs pose for photos before the game against the Los Angeles Chargers at Estadio Azteca on November 18, 2019 in Mexico City, Mexico. (Photo by Manuel Velasquez/Getty Images)

Thousands of furry creature have invaded Malmo in southern Swede on February 23, 2023 to attend the Nordic Fuzz Con, held at at Malmo Live. This year, the convention is expected to attract around 2,500 “furries” from all over the world. (Photo by Johan Nilsson/TT via Alamy Live News)

Daniela Haralambie of Romania competes during the qualification of the women's FIS Ski Jumping World Cup competition at the Gross-Titlis Schanze in Engelberg, Switzerland, Thursday, December 14, 2023. (Photo by Philipp Schmidli/Keystone via AP Photo)

China's Qinwen Zheng celebrates with fans after winning their second round match against Britain's Katie Boulter at the Australian Open in Melbourne on January 18, 2024. (Photo by Edgar Su/Reuters)