If you fail, the rest of the ingredients you put up will be destroyed, so there is a great risk / reward mechanic in play. (thexboxhub.com)
And when you win online events the game has a simple but awesome reward mechanic wherein a little wheel gets spun and you win whatever it stops on! (wolfsgamingblog.com)
While you don't necessarily have to spend real - world money, the harvesting resources function uses a time - based reward mechanic. (finder.com.au)