An aerial drone photo shows a view of the Wujiangzhai scenic spot in Zunyi, southwest China's Guizhou Province, March 14, 2024. The Wujiangzhai scenic spot, with its natural landscape and local folk customs, offers a blend of sightseeing, leisure activities and exhibitions, making it a popular destination for tourists. (Photo by Xinhua News Agency/Rex Features/Shutterstock)

A view of the platform of the Leviathan natural gas field in the Mediterranean Sea is pictured from the Israeli northern coastal beach of Nasholim, on August 29, 2022. (Photo by Jack Guez/AFP Photo)

Drag king Riss Obolensky performs as drag king Norman Creebs during the Opening Cabaret at The London Clown Festival in London, Britain, on July 8, 2024. (Photo by Hollie Adams/Reuters)

Chincoteague Ponies swim across Assateague Channel in a heavy downpour on Wednesday, July 24, 2013 during the 88th Annual Chincoteague Pony Swim. A portion of the herd will be auctioned on Thursday. (Photo by Jay Diem/Eastern Shore News)

Nasoin Akhter, 15, has her makeup done at a beauty parlor on the day of her wedding to a 32-year-old man, August 20, 2015, in Manikganj, Bangladesh. In June of this year, Human Rights Watch released a damning report about child marriage in Bangladesh. The country has one of the highest rates of child marriage in the world, with 29% of girls marrying before the age of 15, and 65% of girls marrying before they turn 18. (Photo by Allison Joyce/Getty Images)

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.

Brides-to-be participate in the “Running of the Brides” race in a park in Bangkok, Thailand March 25, 2017. (Photo by Athit Perawongmetha/Reuters)

A male sea lion Leo writes the word of tiger in Chinese character at a New Year's attraction to celebrate the Year of the Tiger at the Hakkeijima Sea Paradise aquarium in Yokohama, suburban Tokyo on Monday, January 3, 2022. The calligraphy attraction by the sea lion will be carried through January 31. (Photo by Yoshio Tsunoda/AFLO/Rex Features/Shutterstock)