How much is position worth?

I have read that position is even more important in omaha than in hold'em. What if two players competed for $100 dollar pots with random hole cards and flop already dealt, with one player acting first on every hand. How much of the $100, on average, could the player with the better position expect to get?

Can anyone have an educated guess at this? A good estimate of how much postional advantage is worth would help a lot when making preflop decisions about expected value on a hand.

I useful thing to know I reckon, but I have no idea how to start working it out!

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