Many of these are monthly, quarterly, or yearly subscriptions that do not account for a fraction of what the USPS delivers. The USPS delivered over 500 pieces of mail per living person in the US, including children, in 2014.
Were the US to pay for private delivery the 30-40 pieces of critical mail people receive each year and use bulk pricing discounts, they would likely come out ahead.
Were the US to pay for private delivery the 30-40 pieces of critical mail people receive each year and use bulk pricing discounts, they would likely come out ahead.