When Yankees GM Brian Cashman makes a trade, he only moves forward when the exchange is a great value. For example, he bit on the Giancarlo Stanton deal because he acquired Stanton for less than his actual value.
Think about it for a second, that deal was a disaster for the Marlins. Stanton backed them into a corner because of his no-trade clause, and the Yankees were not going to buy him at a premium price because of his gigantic contract. As a result, the Yanks were able to buy low on the NL MVP.