Difference between "potential" and "reality

SON ASKED HIS FATHER: "Daddy what is the
difference between "potential" and "reality"
Dad: I will show  you,
Dad turned to his wife and ask her: "Would you sleep with Tom Cruise for 1 Million Dollars?
Wife answers: "Yes of Course! I would never waste such an opportunity to be a millionaire"
Then Dad asked his daughter if she would sleep with Will Smith for 2 Million dollars?
Daughter: "Wow! Yes Yes Yes!!!!!!!! I will that's my fantasy"
So Dad turned to his elder son and ask him : Son, will you sleep with Denzel Washington for 1 Million dollars?
Elder Son replied: " Yeah! Why not? Imagine what I could do with 1 Million dollars, I would never hesitate!"
So the Father turns to his younger son and said: "You see son, POTENTIALLY" we are sitting on 4 Million dollars, But in " REALITY" we are living with 2 prostitute and 1 gay.