The end of story is, it is cheap to thr end user, AND the taxpayer. Period. Sure, the post office gets 95% of there revenue from 5% of their retail locations. The rest suck money from them in order to ensure UNIVERSAL COVERAGE. Guess what, it isnt universal coverage when you start closing post. Why not, because people will no longer have access.
I don't know when they started, but they've been closing post offices throughout last year... so, according to you, we no longer have Universal Coverage.
So, even by your own standards, the USPS is a failure, since they haven't maintained Universal Coverage.