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.

Men dressed as women kiss as they take part in a parade during the Popo (Mask) Carnival of Bonoua, east of Abidjan, April 9, 2016. (Photo by Luc Gnago/Reuters)

A model poses during the annual World Bodypainting Festival in Poertschach, Austria, July 3, 2015. The event takes place from July 3 to 5 at lake Woerthersee in Austria's southern Carinthia province. (Photo by Heinz-Peter Bader/Reuters)

A man playing the part of a zombi pretends to rise from the dead from inside a coffin at a Carnival parade in Jacmel, Haiti, Sunday, February 23, 2014. The pre-Lent festival began in the streets of this town known for its arts to kick off Haiti’s Carnival festivities. (Photo by Dieu Nalio Chery/AP Photo)

Residents wearing masks rest in the shade near a graffiti of a dragon, Friday, May 27, 2022, in Beijing. (Photo by Ng Han Guan/AP Photo)

Alice Ross views a gold crown which was presented to Queen Victoria, part of the Royal Collection on display at the Queens Gallery on March 13, 2012 in Edinburgh, Scotland. The exhibition, which marks Her Majesty The Queen's Diamond Jubilee, reflects the tastes of monarchs and other members of the royal family who have shaped one of the world's great art collections. (Photo by Jeff J. Mitchell/Getty Images)

A man jokingly poses with a new installation of British graffiti artist Banksy's art in New York, October 20, 2013. (Photo by Carlo Allegri/Reuters)

Liverpool fans walk past a mural of the Beatle’s Abbey Road album ahead of the Carabao Cup final match between Liverpool and Chelsea at the Camp and Furnace venue in Liverpool, Britain, 25 February 2024. (Photo by Adam Vaughan/EPA)