Russian supermodel Irina Shayk shares a snap from an “island summer nite (sic)” in the last decade of August 2022. (Photo by irinashayk/Instagram)

A child applies make-up as a mimic while asking for alms from passers-by at a market area ahead of the festival of Diwali in New Delhi on October 22, 2022. (Photo by Sajjad Hussain/AFP Photo)

Dominique Lynch on Tuesday, February 20, 2024 views Daniel Arsham's Unearthed, Bronze Eroded Melpomene, on display during Daniel Arsham: Relics in the Landscape exhibition, the first UK museum display of work by the highly acclaimed North American, at the Yorkshire Sculpture Park in Wakefield, West Yorkshire. (Photo by Danny Lawson/PA Images via Getty Images)

An employee builds up the figure of the Queen of Hearts from the movie Alice in Wonderland (2010) in the immersive exhibition “Tim Burton's Labyrinth” in Berlin on July 8, 2024. From July 19, 2024, the international exhibition ”Tim Burton's Labyrinth” can be experienced at the Radsetzerei in Berlin. (Photo by Ronny Hartmann/AFP Photo)

People who live in nearby villages make their yearly pilgrimage as they walk up the slopes of the Popocatepetl volcano in Mexico, Wednesday, March 12, 2014. Every year on March 12, residents make their way up the volcano celebrate the day of Don Gregorio Chino Popocatepetl, as the volcano is known to them, with food, music, dance and fireworks. When the sun rises, hundreds of pilgrims head out from the towns of Santiago Xalintzintla, Tlamacas and San Nicolas de Los Ranchos in van and trucks to drive, then walk up the 17,886-foot (5,450-meter) volcano for their daylong celebration. (Photo by Eduardo Verdugo/AP Photo)

Hollywood actress Malin Akerman helps King Digital Entertainment set the Guinness World Record for the World's Largest Hammock to celebrate the launch of its new game Paradise Bay on Wednesday, September 2, 2015, in Jersey City, N.J. (Photo by Charles Sykes/Invision for King World Entertainment/AP 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.

Bulgarian men dance in the icy waters of the Tundzha river during a celebration to commemorate Epiphany Day in the town of Kalofer January 6, 2015. It is believed that the ritual will bring good health to the participants throughout the new year. (Photo by Stoyan Nenov/Reuters)