It's been a while since I've had postage due, but I've had some fun lately.
Twice in the last month, I've had to get eBay involved for a full refund because the seller never shipped the item and wouldn't respond to messages. Both were "new" accounts with no feedback, which I'm usually pretty wary of, but they listed a couple of cards I'd been looking for for years.
Also in the last couple of months, I had a card never ship and finally heard back from the seller. He had been deployed sometime between listing the item and me buying it and had told his son to ship it. That did not happen, but at least he refunded me.
Several listings where the seller used the eBay suggestion for a card that was not at all correct.
Yesterday, I won an auction for a card that started at $9.99 and ended at $29. The seller had put the eBay standard envelope for cards, etc ($1.05) as the primary shipping but since it went over $20, that wasn't actually an option. The auto-invoice right after the auction ended had the shipping as $1.05, which is what I ended up paying. Seller then messages me that I was supposed to change the shipping to regular first class before paying. I got eBay involved because either eBay's system screwed up by not auto-adjusting the shipping based on their own rules or the seller, by adding a note in the description a week after starting the auction, messed up the system. Either way, I'm just not going to send any more money. This wasn't my screw-up and I paid the total that was shown at the postage rate that was posted when I bid. Seller should never have had the standard card envelope option on there to begin with since the card in question pretty much always goes for more than $20.
Speaking of the eBay standard card envelope, the way it ends up working for me is that the tracking doesn't update properly, it gets marked delivered when it gets dropped off at my local PO so then I never know when it will actually show up, and as far as I can tell, the post office hates these and gives them zero priority or secure handling. Also doesn't help that my delivery people are lazy grumpy employees that act like it's a major headache to deliver my mail.
Turning off trading because my collection is in complete disarray after moving and I don't know when I can get it organized.