I don’t think that you know how the Vegas oddsmakers operate when it comes to setting odds and lines.
There is no “equal money“ on odds bets.
If Alabama is 30 to 1 to win the CFP, and USC is 40 to 1 and ND is 50 to 1, there is no “equal money“ or offsetting money for each betting proposition.
As to “equal money” on each game, while that’s the ultimate objective, the difficulty in achieving that goal is the setting of the opening line.
Since Vegas has yet to develop Kreskin like abilities, they can’t read the betting public’s mind when it comes to predicting what the betting public thinks the spread should be.
Hence, there’s essentially a formula, now probably an algorithm, that determines where Vegas thinks the line should be.
As the betting money flows in, the line is adjusted to try to achieve “equal money”
But each line represents a separate betting pool.
There is no inherent bias in establishing lines as Vegas’s only interest is making money and they don’t care who wins and losses.