What a.... limited, I guess, viewpoint.
I personally get a massive benefit from USPS being cheap, despite the fact that I send no mail. It provides a massive low-cost physical delivery network across the country, with service to every address. This is a benefit to me because it makes business and personal communication simple and reliable. If I need it personally, it's there. If I don't, I still rely on thousands of parties who do.
Your position is like claiming the interstate system is useless because you don't have a car, ignoring how all those goods your life relies on actually get to you.
Parent poster is exactly the kind of person who argues that using tax dollars for school is wrong because they, personally, do not have kids. Because they can't realize that they indirectly benefit from it.
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Your comment works great in a vacuum with no other inputs, but it doesn't hold up.
The unintended consequence of this is all the junk mail that makes regular mail a horrible experience to interact with.
Raise the prices , remove the spam.