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.

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)

The front wheels of a tractor, pulling a trailer overloaded with sugarcane, are seen lifted off the ground as it passes through the streets of Karor Lan Esan, Pakistan December 6, 2015. (Photo by Caren Firouz/Reuters)

Construction workers take a lunch break on a steel beam atop the RCA Building at Rockefeller Center, New York, September 29, 1932. In the background is the Chrysler Building. (Photo by AP Photo)

Palestinians sit in a fishing boat loaded into a horse cart as they pass on a street in the northern Gaza Strip on October 19, 2022. (Photo by Suhaib Salem/Reuters)

A Siberian tiger gestures at the Siberian Tiger Park in Harbin, in China's northeastern Heilongjiang province, on January 6, 2023. (Photo by Hector Retamal/AFP Photo)

Maya Goldstein, 7 marches in the Capital Pride Parade in Washington, D.C. on June 10, 2023. (Photo by Amanda Andrade-Rhoades for The Washington Post)

Chloe Kelly and Alex Greenwood of England pose during the official FIFA Women's World Cup Australia & New Zealand 2023 portrait session on July 18, 2023 in Brisbane, Australia. (Photo by Justin Setterfield – FIFA/FIFA via Getty Images)