K, you will never attain tenure if you continue to think that way.
Imagine a three armed man approaches with a package of M&M's in each hand, each of which you value at $.75. You must choose one. You must give up the other TWO packages. You have given up $1.50 of M&M's to get $.75 of M&M's, so the situation is WORSE than Yoram's example of a two armed man with two packs of M&M's, which at least left you with $0 of benefit.
Imagine a three armed man approaches with a package of M&M's in each hand, each of which you value at $.75. You must choose one. You must give up the other TWO packages. You have given up $1.50 of M&M's to get $.75 of M&M's, so the situation is WORSE than Yoram's example of a two armed man with two packs of M&M's, which at least left you with $0 of benefit.