[slg]

I generally agree, which is why I made the distinction between "pay" and "buy". Although you also have to factor in that rosters have a limited size. If you are calling up a player, you need to get rid of a player. Veterans have guaranteed contracts, so adding a young player to replace a veteran will increase payroll like you suggested. However a young player's salary doesn't have the same guarantee if they are removed from the roster. Therefore shuffling out one young player for another generally has little to no impact on the overall payroll.