A biker passes by a pair of mailboxes in the Capitol Hill neighborhood November 6, 2012 in Denver, Colorado. Colorado is considered by most experts to be one of the key battleground state in this year's presidential election. (Photo by Marc Piscotty/AFP Photo)

Ashley Roberts in the last decade of October 2022 poses a pretty question as she models for online fashion site Quiz. The Pussycat Dolls singer and Heart Radio host, 41, is the new face of the brand and has collaborated on its partywear collection. (Photo by Quiz)

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.

The newly-discovered gaseous planet Kepler-16b orbits it's two stars. NASA's Kepler Mission discoverd the world orbiting two Stars, the larger a K dwarf and the smaller a red dwarf. (Photo by NASA/JPL-Caltech/T. Pyle via Getty Images)

Megan Barton-Hanson attending the ITV Summer Party 2019 at Nobu Shoreditch in London, England on July 17, 2019 holding hands with Demi Sims. (Photo by SOPA Images via Getty Images)

Caroline Wozniacki of Denmark serves to Alisa Kleybanova of Russia during the BNP Paribas Open at the Indian Wells Tennis Garden on March 15, 2011 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)

Using clever low exposure techinques, photographer Rolf Maeder managed to capture multiple strikes hitting the canyon under atmospheric stormy skies. (Photo by Rolf Maeder)

Dressed in traditional make-up and costume a woman participates in the celebration for the Day of the Dead or Día de los Muertos at the Hollywood Forever Cemetery in Los Angeles on Saturday, October 30, 2021. Day of the Dead, is a Mexican holiday where families welcome back the souls of their deceased relatives for a brief reunion that includes food, drink and celebration. (Photo by Richard Vogel/AP Photo)