Azerbaijan's Mariya Stadnik (R) wrestles Mongolia's Otgonjargal Dolgorjav (L) in their women's freestyle 50kg wrestling quarter-final match at the Champ-de-Mars Arena during the Paris 2024 Olympic Games, in Paris on August 6, 2024. (Photo by Punit Paranjpe/AFP Photo)

Sofia Evangelia Malkogeorgou and Evangelia Platanioti of Greece perform in the duet technical routine of the artistic swimming event during the Paris 2024 Olympic Games at the Aquatics Centre in Saint-Denis, north of Paris, on August 9, 2024. (Photo by Gonzalo Fuentes/Reuters)

Showgirl Amy Findlay after the the rehearsals for Circus Vegas in Newcastle, Britain on July 27, 2023. (Photo by Lee Smith/Reuters)

Italian model Vittoria Ceretti presents a creation by designer Virginie Viard as part of her Spring/Summer 2024 Women's ready-to-wear collection show for fashion house Chanel during Paris Fashion Week in Paris, France ob October 3, 2023. (Photo by Sarah Meyssonnier/Reuters)

“We've reached 40km.” – Participants run at the 40km mark of the 2025 Chosun Ilbo Chuncheon Marathon, held in Chuncheon, Gangwon Province, South Korea on the afternoon of the October 26, 2025. (Photo by Park Seong-won)

A member of the pro-government “red shirt” movement attacks a Buddhist monk outside the National Anti-Corruption Commission office in Nonthaburi province, on the outskirts of Bangkok March 24, 2014. Members of the movement attacked the monk after he shouted complaints to the group blocking a road near the National Anti-Corruption Commission. (Photo by Chaiwat Subprasom/Reuters)

Archie, a Chinese Crested dog, sits with his tongue out before the start of the 20th Annual Ugliest Dog Competition at the Sonoma-Marin Fair June 20, 2008 in Petaluma, California. Owners of ugly dogs travel to Petaluma from all over the country to participate in the annual contest. (Photo by Justin Sullivan/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.