Oh, I didn't mean the USPS shouldn't be subsidized. I view it as a government provided service that we pay to use. The government part means it's available everywhere to everyone, while paying to use it makes it more fair. I don't expect it to make money - at best it should brake even, so government subsidy at times is fine. What I have a problem with is first class mail subsidizing junk mail. Without junk mail you'd still need a carrier to visit every day for pickup, but the stop will still be faster without a pile of crap to put in there. Or they could make the service run every other day, but that increases worst case delivery by 2 days. There are lots of ways to make adjustments, but having bulk pay well under 10 cents is really a bad joke since it still uses all the infrastructure that first class has put in place.
If they want to run it like a business and not a government provided service then they at least have to charge enough to pay their bills, and that includes ALL mail.