The monthly leadearboard promotion is basically the same as wagering competition in other casinos.
It works the same where players are competing with other players to have the most wagered amount in monthly basis.
What makes the wagering competition in bk8 a bit different to other casinos is about the reward.
Most reward in BK8 is in a form of physical reward such as car, gadget, and some other electronic stuffs while other casinos usually use money/direct balance for the reward.