English actress Kate Beckinsale attends the GQ Men of the Year Awards at Tate Modern on September 5, 2018 in London, England. (Photo by Karwai Tang/WireImage)

American singer and model Ciara in the second decade of March 2023 makes a very important phone call. (Photo by ciara/Instagram)

Liam Hemsworth's girlfriend fashion model Gabriella Brooks stuns in swimsuits as the new Seafolly global ambassador and face of this season's “Escape To Summer” campaign on October 11, 2021. (Photo by Seafolly/The Mega Agency)

English singer and songwriter Dua Lipa poses in the second decade of November 2022 in nothing but a bra backstage. (Photo by dualipa/Instagram)

UK Love Island's Maura Higgins attends the Pretty Little Thing X Molly-Mae party at Rosso on September 01, 2019 in Manchester, England. (Photo by Splash News and Pictures)

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.

Britain's Catherine, Duchess of Cambridge plays a stroke of golf during a visit to meet young people supported by the Cheesy Waffles Project, a charity for children, young people and adults with additional needs across County Durham, at the Belmont Community Centre, in Durham, north east England on April 27, 2021. (Photo by Andy Commins/Pool via AFP Photo)

A man poses as “Lemongrab” from Adventure Time outside the MCM Comic Con at the Excel Centre in East London, October 25, 2014. (Photo by Andrew Winning/Reuters)