Family-Unfriendly Aesop: Most of the tales have this. In Snow White and the Seven Dwarfs Snow White steals the Queen's magic mirror and so the dwarfs, who are all gamblers with debts, can use it to accurately predict which horses will win races the following day. Because they know exactly which horses will win every time the dwarfs and Snow White end up becoming millionaires through gambling.
Which shows that gambling's not a sin
Provided that you always win.
- Arguably, Cinderella has a relatively ordinary Aesop, where Cinderella decides to marry a good man who is a jam maker rather than marry someone just because he happens to be a wealthy prince.