Residents walk past a burnt car blocking the street as they evacuate the Delmas 22 neighborhood the morning after an attack amid gang violence in Port-au-Prince, Haiti, May 2, 2024. (Photo by Ramon Espinosa/AP Photo)

In this Sunday, August 5, 2018 photo, a dancer winces in pain as she is whipped by a fellow dancer in an adaptation of the Inca warrior dance known as “Kachampa”, during celebrations honoring Our Lady of Copacabana, in Cuzco, Peru. (Photo by Martin Mejia/AP Photo)

Pоrn actresses take a break at the Venus erotic fair in Berlin, Germany, October 15, 2015. The event, which represents the erotic business in the German capital, is open till October 18, 2015. (Photo by Fabrizio Bensch/Reuters)

An Orthodox believer kisses an icon during a pilgrimage celebrating the icon of St. Nicholas in the village of Velikoretskoye in Kirov Region, Russia on June 6, 2021. At least 17 thousand pilgrims, loaded with backpacks and some of them barefoot, took part in a five-day and 150-kilometer-long journey from Kirov to the village of Velikoretskoye, according to the local media. (Photo by Alexey Malgavko/Reuters)

Carine Louis-Jean, 22, poses for a photograph in her destroyed house after Hurricane Matthew hit Jeremie, Haiti, October 17, 2016. “The roof of my house is completely gone and some of walls were destroyed. I have lost everything I had, but I thank God that I have a friend who is letting me stay at her house. I could say I'm lucky, because none of my family died during the hurricane, but I do not think I'm lucky”, said Louis-Jean. (Photo by Carlos Garcia Rawlins/Reuters)

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.

Tam Nakano and Maika compete during the Women's Pro-Wrestling “Stardom” at Korakuen Hall on October 17, 2021 in Tokyo, Japan. (Photo by Etsuo Hara/Getty Images)

Members of the Colombian Navy stand guard on top of a seized submarine built by drug smugglers in a makeshift shipyard in Timbiqui, department of Cauca February 14, 2011. Colombian authorities said the submersible craft was to be used to transport 8 tons of cocaine illegally into Mexico. (Photo by Jaime Saldarriaga/Reuters)