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 little girl hangs three Siamese kittens on a washing line in a garden in Croydon, London. (Photo by Fox Photos/Getty Images). 14th July 1931

British singer Rita Ora ready to record in the studio in North West London, United Kingdom on October 13, 2020. (Photo by Click News and Media)

Kimono-clad women from Thailand take selfies among blooming cherry blossoms at Ueno Park in Tokyo, Japan on March 27, 2021. (Photo by Kim Kyung-Hoon/Reuters)

A reveller takes part in an annual block party known as “Ceu na Terra” (Heaven on Earth), during carnival festivities in Rio de Janeiro, Brazil February 3, 2018. (Photo by Pilar Olivares/Reuters)

In this Sunday, February 18, 2018 photo, Palestinian camel herder Salem Rashaideh, leads the way for the camels in the territory of Israeli Kibbutz Kalya, near the Dead Sea in the West Bank. For three months a year, in the winter time Bedouin Arab herders take their 130 camels to graze on the shores of the Dead Sea, at the lowest place on Earth. (Phoro by Oded Balilty/AP Photo)

Fishermen carry calabashes to attend Argungu fishing and cultural festival at Argungu Town, Kebbi State in northwestern Nigeria, on March 14, 2020. Argungu fishing and cultural festival is one of the oldest and most widely attended festivals in the country dating back many generations, featuring series of water competitions and traditional games. The festival returned after 10 years suspension due to insecurity in northwest Nigeria. (Photo by Pius Utomi Ekpei/AFP Photo)

Thierry Neuville of Belgium drives his Hyundai i20 Coupe WRC during day 3 of Rally Mexico, in Leon, Guanajuato, Mexico, 14 March​ 2020. (Photo by Reporter Images/EPA/EFE)