Dani Alves of Paris Saint-Germain and Spanish model Joana Sanz are pictured inside the photo booth prior to The Best FIFA Football Awards at Royal Festival Hall on September 24, 2018 in London, England. (Photo by Michael Regan – FIFA/FIFA via Getty Images)

On the second straight day of record-setting temperatures, Maddy Hacker is hoisted up by friend Jasmine Harper, both of McLean, Virgnia, as they attempt an acrobatic stunt in front of the U.S. Capitol in Washington, U.S., February 21, 2018. (Photo by Kevin Lamarque/Reuters)

Singer Ariana Grande performs during the 2014 MTV Europe Music Awards at the SSE Hydro Arena in Glasgow, on November 9, 2014. (Photo by Toby Melville/Reuters)

The Washington Wizards dancers strike a pose during the team’s basketball game against the Minnesota Timberwolves at Capital One Arena on November 28, 2022 in Washington, DC. The Wizards won 142-127. (Photo by Geoff Burke/USA Today Sports via Reuters)

Male members of the Zeleziar folk dance group whip and water the local girls dressed in traditional clothing, during Easter in Bociar, Slovakia on April 1, 2024. Boys and younger men visit the houses of young girls, whip them with fresh-cut decorated wickers and sprinkle water on them. By tradition, the whipping should give the girls strength, health, and abundance throughout the whole year. (Photo by Robert Nemeti/Anadolu via Getty Images)

A chimpanzee relaxes in the shade at the Safari Park as the popular attraction prepares for the upcoming Jewish festival of Pesach (Passover) on April 14, 2008 in Ramat Gan near Tel Aviv, Israel. (Photo by David Silverman/Getty Images)

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 vender arranges goods for sale at a market on the outskirts of Buenos Aires, Argentina, Wednesday, January 10, 2024. (Photo by Natacha Pisarenko/AP Photo)