I find most buyers are completely decent.
I buy a lot more than I sell, but I've never had any issues whatsoever with buyers; and I always try to be a good buyer myself. I hate the way eBay feedback asks you if the item arrived by a certain day, as estimated, because they often don't - but that's because of issues with the post right now, where I might have several items 'late' from different sellers that all come on the same day. I don't like to lie, but I don't want to get them into trouble for something that isn't their fault. Plus, I might be unusual, but most things I order aren't urgent at all. Of course I want them ASAP, but I'm an adult - if they take two days or two weeks, it doesn't really matter in the scheme of things; I haven't put the rest of my life on hold until I can read a certain book that I've ordered.
Twice, as a buyer, I've had items not arrive after over two weeks and I've raised a query (not a complaint). Both times, I just got a message that I'd had a refund, which I suppose solved the issue, but I was a bit miffed not to even receive a one-line message from the seller.
One time, I bought a collection-only item and the (very friendly) man met me on his doorstep with his phone, told me he was going to cancel the transaction "as eBay take a fortune in fees" and did so, before cheerily completing the transaction with me 'under the counter' as it were. I felt very uneasy and it was rather awkward, but I didn't really know what to say, so I just let him do it. It didn't really make any difference to me, but I'm guessing that if he does it regularly (the item was about £35, so nothing hugely expensive), he's going to be punished, put down the listings and/or banned by eBay. I suppose they could even report him for fraud, as that's what it is. If you don't want to pay eBay fees, you're perfectly at liberty to use another way to find your buyer and not use them. If nobody every paid their fees, eBay would cease to exist for parasites people like that. I wonder how he'd feel if he were a salesman on commission who had found a buyer and seller, put them in touch with each other and brokered a deal, and then they both said "Hey, I want to sell, you're here to buy it, so we don't need him - why should we pay him anything?!"