A girl I used to work with had a deal with her boyfriend: On payday, they would go to the casino - but they would only take $20 each and when the $20 was gone, they'd go home. If you
must gamble, that seems like a sensible approach.
However, one time they had barely walked in the door when he won $400. He put it into his pocket and they continued until both had used up their original $20. He said it was time to go home but she wanted him to continue with the $400 that he had won.
Of course, that's how they get you: If you lose, you want to win it back; if you win, you want to win more so you keep playing until you lose your winnings.
And our geese will blot out the sun.