A limited nutrient will put a cap on milk production. An excess nutrient only results in added cost and maybe unhealthy cows. The feeds need to balance with milk production. Feeding for 90 pounds of milk and getting 60 pounds of milk just results in increased costs. Manage your finances.
Financial costs can be the difference between profit and loss.
Time spent with your financial records can be as profitable as time spent with your production records. There are always exceptions. I have observed that all systems will work for someone but that no system is perfect for everyone. It is more important that a farmer uses his resources. Many people have interpreted this to mean that bigger is better.