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.

Flamengo soccer fans cheer a goal scored by Gabriel against Argentina's River Plate in the Copa Libertadores final match, broadcast on a giant screen at a watch party at the Macarena Stadium, in Rio de Janeiro, Brazil, Saturday, November 23, 2019. The first single-match final will be played in front of more than 65,000 fans at Lima’s Monumental Stadium. The match was originally scheduled for Santiago’s National Stadium, but it was moved because of street protests in Chile. (Photo by Silvia Izquierdo/AP Photo)

United States's Jessie Diggins celebrates winning the cross-country ski, women's Tour de Ski overall standings, in Val di Fiemme, Italy, Sunday, January 7, 2024. (Photo by Alessandro Trovati/AP Photo)

A Hindu devotee drinks water from the Ganges River at the Sangam area, the confluence of rivers Ganges, Yamuna, and the mythical Saraswati, in Allahabad on March 16, 2021. (Photo by Sanjay Kanojia/AFP Photo)

Girls ride an improvised motorbike public transport along with bicycles they received from their school under a government scheme in Malancha, South 24 Pargana district, India, Wednesday, October 20, 2021. (Photo by Bikas Das/AP Photo)

Children stand next to an image of a Chinese space suit displayed on a screen, at the InnoTech Expo in Hong Kong, China on December 13, 2022. (Photo by Tyrone Siu/Reuters)

Mariam, a 9-year-old girl, carries her brother as she stands with other children at an underground ancient cemetery in Jabal al-Zawiya in the southern countryside of Idlib November 26, 2014. Residents are using ancient caves and cemeteries as underground shelters to hide in during shelling from forces loyal to President Bashar al-Assad. Picture taken November 26, 2014. (Photo by Khalil Ashawi/Reuters)

Flames from the Jerusalem Fire erupt in Lake County, California August 12, 2015. The wildfire running rampant through drought-parched vegetation in northern California grew by several thousand acres overnight into Wednesday, as firefighters worked to stop the flames from spreading toward communities. (Photo by Robert Galbraith/Reuters)