There is one significant assumption Mili and Bucky Katt are making - the average price per piece.
The volume of junk mail far outweighs the balancing of revenues from higher priced large letter or parcel delivery. That overwhelming volume of business / junk mail is discounted in cost. This results in a net price for every piece handled by the USPS of about $0.38, resulting in their revenues for
2009 of about $68-Billion.
I agree, if they were operating at an average price per piece of $0.44 they would be in clover - well, to the tune of about $9 Billion in profit. I'm heartened to hear you both implicitly support a hike in postal rates to a more realistic level. Bring back Saturday service!
As for that $9 Billion in profit they would then rake in with an average rates of $0.44 per piece. That is more than enough to offset the unusual manner in which they have to declare all their pension obligations instantly (the $8.5 Billion charge found on page 4 of the earlier linked piece). Notably, that is an acounting "burden" which is not foisted on UPS or FedEx.