In this photo taken on April 14, 2022, people visit the Light Festival to celebrate the 110th birth anniversary of late North Korean leader Kim Il Sung at Kim Il Sung Square in Pyongyang. (Photo by Kim Won Jin/AFP Photo)

Lucaz Adamus (3), from Lucan, enjoying the Dublin Racing Festival, at Leopardstown Racecourse in Dublin, Ireland on February 5, 2023. (Photo by Tom Maher/Inpho)

A giraffe quenches its thirst at a watering hole at Zimanga Private Game Reserve, South Africa in the second decade of December 2023. (Photo by Janette Hill/Animal News Agency)

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 firefighter rests next to fire combat truck during a wildfire at Penela, Coimbra, central Portugal, on June 18, 2017. A wildfire in central Portugal killed at least 25 people and injured 16 others, most of them burning to death in their cars, the government said on June 18, 2017. Several hundred firefighters and 160 vehicles were dispatched late on June 17 to tackle the blaze, which broke out in the afternoon in the municipality of Pedrogao Grande before spreading fast across several fronts. (Photo by Patricia De Melo Moreira/AFP Photo)

This young boy wrestled with his emotions at the National Children’s Sumo ­Tournament in Tokyo on July 30, 2012. (Photo by AP Photo/LaPresse)

«Little Red Riding Hood». “The moment I pulled this sweater out of the drawer for Frankie I knew what I wanted for my picture today. I envisioned the look, the style, and the composition. When working with a 2 year old it is never easy to actually get the shot you want, especially when they decide to skip nap time. But I really like how this one turned out” – Rich. (Photo by Rich)

A cast member from The Lion King goes to take up her position for the performance during The Olivier Awards 2019 with Mastercard at the Royal Albert Hall on April 07, 2019 in London, England. (Photo by David Levene/The Guardian)