Models wait backstage before the Heaven Gaia Autumn/Winter 2021 collection show by Xiong Ying during China Fashion Week in Beijing, China on March 25, 2021. (Photo by Tingshu Wang/Reuters)

People celebrate outside the Supreme Court, Friday, June 24, 2022, in Washington. The Supreme Court has ended constitutional protections for abortion that had been in place nearly 50 years, a decision by its conservative majority to overturn the court's landmark abortion cases. (Photo by Jacquelyn Martin/AP Photo)

A Palestinian boy pours water over his head in Khan Yunis in the southern Gaza Strip, on July 22, 2020. (Photo by Mohammed Abed/AFP Photo)

Annabelle, 13, and her sister Estelle, 10, both artistic gymnasts from Borna, hang from the rings during their training, ahead of the Special Olympics World Games Berlin 2023, the world's largest sports movement for people with intellectual disabilities, at the Federal base for competitive gymnastic artistics in Chemnitz, Germany on May 6, 2023. (Photo by Annegret Hilse/Reuters)

English television presenter Maya Jama attends The Fashion Awards 2022 at the Royal Albert Hall on December 05, 2022 in London, England. (Photo by Backgrid UK)

Free for Editorial Use Ballerinas from The Royal Ballet School perform on December 2, 2025 under Covent Garden's first festive snowfall to launch the destination's daily December snow flurries. (Photo by Paul Grover/Covent Garden)

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.

Fresh produce and baskets of fish surround a woman at the Siti Khadijah market in Kota Bharu, Malaysia. (Photo by Duratul Ain D.)