The costs are just as sunk as they are fixed. In either case, they can be changed if the players are moved, but the chances that these players will be moved is highly unlikely. Sunk cost is often the term used as the contracts cannot be renegotiated. They are budgeted and already accounted for on the ledger. While they could be recovered, the chance is so slim as to be considered sunk. The money has already been invested and is spinning down the toilet. If I am building a house, and I invest $300,000 in materials, those are a sunk cost. If the land is found to be a swamp, and I need to put in an extra $200,000 to fix it, the original $300,000 is sunk, and I have to look at the entire investment or I could be chasing bad money with good. With the Mauer contract, the money he is owed is a contract for service. If Mauer bats .150 and needs a pinch runner to get to second base, the money is still owed. It is no less owed than the money contracted for the materials for the home. In both cases, some money can be recoved by selling the materials on Craigslist, trading Mauer, or selling Mauer on Craiglist, but they are both considered sunk because the contract for service or goods is due in its entirety if the goods had been delivered on site or not.