Craps -Passline and Odds bets - Worth It?

[lostinspace]

In Sklansky's book "Getting the best of it" he claims casino craps CANNOT be beat. That it always yeilds a negative expectation. Other authors claim that according to the laws of probabiltiy if you ONLY make the passline and odds bets you gain an advantage.

Is this true?

Can some one explain in simple mathematical terms why the passline and odds bets are positive (or negative )expectation plays?

Thanks