Climate activists of the “Last Generation” covered with mud protest in front of the Senate building in Rome, Italy, Tuesday, May 23, 2023. Two bare breast activists have smeared the facade of the senate with mud, shouting the slogan: “Help us for the ecological transition”. (Photo by Cecilia Fabiano/LaPresse via EXPA)

A lifeguard warns swimmers as a sea gull flies by on Labor Day at Daytona Beach in Florida on September 4, 2023. (Photo by Paul Hennessy/SOPA Images/LightRocket via Getty Images)

A Hindu holy man shouts religious slogans during a procession to mark 'Krishna Janmashtami' in Srinagar, Indian controlled Kashmir, Friday, August 19, 2022. Krishna Janmashtami marks the birth of Hindu god Krishna. (Photo by Mukhtar Khan/AP Photo)

A frozen public bench is seen next to a lake side due to the heavy wind conditions in Geneva February 8, 2015. (Photo by Pierre Albouy/Reuters)

Fireworks explode over Elizabeth Tower housing the Big Ben clock in London. (Photo by Kirsty Wigglesworth/Associated Press)

Wild Thang, a Pekingese competing in the 2023 World’s Ugliest Dog Contest sits in the waiting kennel before the start of the annual World's Ugliest Dog contest at the Sonoma-Marin Fair in Petaluma, California, on June 23, 2023. Scooter was the winner of the 2023 World’s Ugliest Dog Competition. (Photo by Philip Pacheco/AFP Photo)

Armed Syrian Turkmen villagers are seen near the northern Syrian village of Yamadi, near the Turkish-Syrian border, Syria, November 24, 2015. Turkey shot down a Russian warplane near the Syrian border on Tuesday saying it had repeatedly violated its air space, one of the most serious publicly acknowledged clashes between a NATO member country and Russia for half a century. (Photo by Reuters/Stringer)

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.