There’s no such thing as a free lunch, especially in the postal world. Someone has to pay for mail to come to your door 6 days a week and for post offices to be open and accessible throughout the country.
No pain no gain. The U.S. Postal Service has reduced spending over the past decade but it has come with a downside, notably a reduction in service. Over the past decade the Postal Service has reduced labor costs by $10 billion, improved productivity, and generally reined in spending.