Children with balloons play beside the statue of British comedy legend Eric Morecambe on January 16, 2012 in Morecambe, England. According to scientists January 16, 2012 was “Blue Monday”, the most depressing day of the year. (Photo by Christopher Furlong/Getty Images)

A person takes photos of Vervet monkeys that are eating in a parking lot near the Fort Lauderdale-Hollywood International Airport in Dania Beach, Florida, USA, 10 May 2022. Over 40 descendants of smallish vervets, escaped from now closed breeding facility, are living within 1,500 acres around the Fort Lauderdale-Hollywood International airport. The Dania Beach Vervet Project is an organization established in 2016 with the purpose of promote the conservation, and education about the local free ranging vervet monkeys in Dania Beach, Florida. (Photo by Cristóbal Herrera/EPA/EFE)

Festivalgoers watch two actors of the Wasteland Warriors movement fight in a cage at the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 3, 2019. Wacken is a village in northern Germany with a population of 1,800 that has hosted the annual festival, which attracts heavy metal fans from around the world, since 1990. (Photo by Wolfgang Rattay/Reuters)

A Geminid meteor streaks diagonally across the sky against a field of star trails behind one of the peaks of the Seven Sisters rock formation in this long exposure early December 14, 2007 in the Valley of Fire State Park in Nevada. The meteor display, known as the Geminid meteor shower because it appears to radiate from near the star Castor in the constellation Gemini, is thought to be the result of debris cast off from an asteroid-like object called 3200 Phaethon. The shower is visible every December. (Photo by Ethan Miller/Getty Images)

New York City Deputy Police Commissioner John A. Leach, right, watching agents pour liquor into sewer following a raid during the height of prohibition, circa 1921. (Photo by Tom Marshall/Mediadrumworld)

A model presents creations from the 2023 Spring/Summer collection by Japanese designer Lim Asafuji for the label “pays des fees” during the Tokyo Fashion Week in Tokyo, Japan, 01 September 2022. The presentation of the 2023 Spring/Summer collections runs from 29 August to 03 September. (Photo by Franck Robichon/EPA/EFE)

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.

Nancy Ponce of Donna gets her hair done in the tag team creativity cut during the 2nd Annual El Grito Barber Derby competition at club Famoso Fuego Sunday, September 18, 2022 in McAllen. (Photo by Delcia Lopez/The Monitor via AP Photo)