Re: If you had $25k and needed $100k
I think what he means is, taking odds does not change the house advantage of the original Pass Line bet, which still remains at 1.41% no matter how much odds you place behind it.
the COMBINED house edge of the odds and pass line can be reduced by taking as much as possible, but the TOTAL EXPECTATION to the house remains the same since you have to risk a higher amount overall to lower that house edge in the first place. this is why you double down in blackjack according to basic strategy even when your chances of winning the hand are lowered. the house advantage increases but so does your expectation on that particular hand.
however, in craps there is very little you can do (if anything) to alter the long-term expectation of the pass line bet. the main thing that odds do is increase volatility of outcome for both the player and the house. this is why the multipliers are capped even though mathematically it doesn't make a difference to either party.
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