What are the practices of ordinary people? We are all motivated by the wish to be happy and free from suffering. Therefore the ‘practices’ of ordinary (or worldly) people are to try to be happy and avoid suffering. They try to increase the odds that this will be the case through their daily actions.
The odds are uncertain, however because the cause of happiness is not the objects we come into contact with, but rather our karma.
Spiritual practitioners understand that their virtuous actions are the causes of their future happiness, and the odds are 100%!
Understanding that virtuous actions guarantee experiences of happiness in future, this sign in the bookmakers window reminds me that I should practice virtue at all times (as well as avoiding non-virtue and keeping a beneficial intention).