I'll just quote the email with their reasoning.
...."If you play a if wager with the parent wager being later than the daughter wager, then
you know going into the later wager weather you won your if wager. Meaning its easier
to buy a point or two and attempt a middle when all it would cost you is one wager to win
the possiblility to win three wagers.
I hope this confusing explaination helps you."