Cost Per Win compares each MLB teams payroll to that of their win total to determine the effective amount of money the team spends for each win. It's calculated by taking a teams payroll and dividing by the number of wins.
More about MLB Cost Per Win (By season)
This can be a useful statistic in determining which teams are getting the most “bang for their buck” out of their roster, though it can also be slightly misleading. Regardless of how well they perform, teams with the highest payrolls are almost always going to be at the top of this list regardless of how well they play. This is because the last few wins are the hardest to get, so to speak, and teams are going to end up paying more to put themselves in a position to get 82 or more wins.