A camel is seen in front of the pyramids, which is one of the seven wonders of the world that was visited by 14.9 million tourists last year in Giza, Egypt on February 21, 2024. The pyramids were named after the tombs of fathers, sons and grandsons, including the largest pyramid Cheops (King Khufu), the middle pyramid Khafre (King Khafre) and the small pyramid Menkaure (King Menkaure). (Photo by Utku Ucrak/Anadolu via Getty Images)

A pro-Palestinian demonstrator sticks her tongue out as she is escorted to a police vehicle outside a building housing the Israeli Consulate in San Francisco, Monday, June 3, 2024. Police arrested Palestinian supporters Monday who occupied the lobby of the building. (Photo by Jeff Chiu/AP Photo)

A tern chick takes its first steps in the first decade of June 2024 at Nickerson Beach, New York, a common nesting location. (Photo by Suraj Ramamurthy/Solent News)

A handset is seen in a damaged phone booth, a day after an Israeli strike on residential buildings in Maaysrah, north of Beirut, Lebanon on September 26, 2024. (Photo by Louisa Gouliamaki/Reuters)

A miner with a donkey makes his way through the low and narrow tunnel leading out of a coal mine in Choa Saidan Shah in Punjab province, April 29, 2014. Workers at this mine in Choa Saidan Shah dig coal with pick axes, break it up and load it onto donkeys to be transported to the surface. Employed by private contractors, a team of four workers can dig about a ton of coal a day, for which they earn around $10 to be split between them. The coalmine is in the heart of Punjab, Pakistan's most populous and richest province, but the labourers mostly come from the poorer neighbouring region of Khyber Pakhtunkhwa. (Photo by Sara Farid/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.

A competitor poses on the catwalk during the Miss Bumbum Brazil 2016 pageant in Sao Paulo, Brazil on November 9, 2016. Fifteen candidates compete in the annual pageant to select Brazil' s sexiest female rear end. (Photo by Miguel Schincariol/AFP Photo)

A Syrian man rides his bicycle past a man selling grains during a halt in fighting on February 29, 2016 in Douma, in the Eastern Ghouta region, east of the capital Damascus. A UN-backed ceasefire deal took hold across parts of Syria, bringing relative calm to areas where the Islamic State group and Al-Qaeda's local affiliate are not present. (Photo by Sameer Al-Doumy/AFP Photo)