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.

Nikolai Vasilyev, 62, dressed as Father Frost, Russian equivalent of Santa Claus, water-skis along the Yenisei River outside Siberian city of Krasnoyarsk, Russia, December 10, 2015. Vasilyev, a teacher of the Krasnoyarsk Aerospace Academy, constructed the self-made water skis to travel on the water surface. The skis are made of plastic foam and the sticks are designed to propel him forward. (Photo by Ilya Naymushin/Reuters)

Ginger Stanley performs a grand jete during her solo underwater ballet at Silver Springs, Florida. (Photo by Bruce Mozert/Three Lions/Getty Images). Circa 1956

Russian riot policemen beat young PREGNANT female anti-Putin activist during a protest rally against the Presidential inauguration of Vladimir Putin on May 6, 2012 in Moscow, Russia.

American singer-songwriter Beyoncé stuns in a driveway photoshoot in the second decade of February 2022. (Photo by beyonce/Instagram)

American model and actress of Brazilian descent Barbara Linhares Ferreira is euphoric in white in the second decade of June 2022. (Photo by barbieferreira/Instagam)

A woman dressed in Ukrainian national costume poses for a photograph in front destroyed Russian military equipment at Khreshchatyk street in Kyiv on August 20, 2022, that has been turned into an open-air military museum ahead of Ukraine's Independence Day on August 24, amid Russia's invasion of Ukraine. (Photo by Dimitar Dilkoff/AFP Photo)

People holding umbrellas under strong wind walk pass a crosswalk as tropical storm Ma-on passes Hong Kong, Thursday, August 25, 2022. (Photo by Anthony Kwan/AP Photo)