I'll play Devil's Advocate. I think the USPS has been subsidized by taxpayers (maybe as it should be?) for decades and, with increased competition and reduced usage due to the internet, prices are rising.
If the USPS isn't to your liking, go with UPS, FedEx, DHL, etc. Oh wait, their costs are higher! Got it.
I've done a fair amount of selling via the eBay/PayPal cabal, and quit when their take went past 30%! They rip off the small sellers and give reduced rates to commercial operators. It's obvious that the small sellers, who gave them their start, are now no longer wanted.