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.

Burning Man 2013. The federal government issued a permit for 68,000 people from all over the world to gather at the sold out festival, which is celebrating its 27th year, to spend a week in the remote desert cut off from much of the outside world to experience art, music and the unique community that develops. (Photo by Neil Girling)

A man reacts as health workers help collect a nasal swab sample to test for COVID-19 in Hyderabad, India, Thursday, September 17, 2020. As India’s coronavirus confirmed cases jump by a record 97,894 cases in the past 24 hours, Prime Minister Narendra Modi’s government faced a scathing opposition criticism in Parliament for its handling of the pandemic and a contracting economy leaving millions jobless on Thursday. (Photo by Mahesh Kumar A./AP Photo)

Italian rider Eva Lechner competes in the women's elite race of the “Hotondcross” cyclocross, the competition's fourth stage of the DVV Trofee Cyclocross in Ronse, on December 14, 2019. (Photo by David Stockman/BELGA/AFP Photo)

Fans dressed up in costume await the cast members on the red carpet at the world premiere of the film "The Avengers: Endgame" in Los Angeles, California, April 22, 2019. (Photo by Mario Anzuoni/Reuters)

Inmates are seen at the transgender gallery in La Joya prison on the outskirts of Panama City, Panama February 3, 2016. Inmates of La Joya prison on the outskirts of Panama City are housed in makeshift cells amid heavy overcrowding, living in grimy conditions and with limited medical attention. Many prisoners in the Central American nation languish for years without being sentenced. (Photo by Carlos Jasso/Reuters)

This time exposure photo provided by the Santa Barbara County Fire Department shows a series of lightning strikes over Santa Barbara, Calif., seen from Stearns Wharf in the city's harbor, Tuesday evening, March 5, 2019. A storm soaking California on Wednesday could trigger mudslides in wildfire burn areas where thousands of residents are under evacuation orders, authorities warned. (Photo by Mike Eliason/Santa Barbara County Fire Department via AP Photo)

Journalists interview a girl, member of the Cryophile amateurs winter swimmers club, after bathing in the ice waters of the Yenisei River, during the celebrations for the upcoming Christmas and New Year, in Krasnoyarsk, Russia, December 23, 2017. (Photo by Ilya Naymushin/Reuters)