No, It’s more like clockwork than 1 out of 600. Your “use someone else” line sounds a lot like what the TSA says to people who object to being treated like muslim terrorists whenever they want to fly on an airplane. The USPS only exists now because it has was given a monopoly on first class mail. Outside of that, I certainly do use “someone else” whenever I can (internet, online bill pay, fax machines, cell phones), and I’m not alone. The USPS should have been completely privatized or liquidated years ago because it’s going to find customers abandoning it in droves or dying off.
Good for you!