Life's too short to have to deal with snaky, ignorant eBay sellers. I've been on eBay as a seller and buyer (sold lots of stuff, mostly discount surplus hand tools and new surplus auto parts) and as a seller, I go out of my way to be civil and cordial to potential buyers, even when I get stupid questions (such as asking details about the item, which I have already provided clearly in the listing).
I know sizeable numbers of people have reading and comprehension difficulties, so I make allowances for them.
I put up lots of clear pictures from every angle, a comprehensive description and clear and simple selling terms.
When I see a seller with a 100 paragraphs of seller terms, and 1 sentence describing the item, I click it off. I don't need to deal with Philadelphia lawyers.
I have nearly 2000 feedbacks with 100% rating, and I've never had to refund anyone yet - and I've bought probably 1000 good items off a lot of nice people, from countries as diverse as Italy, Germany, Turkey, Greece, and the U.S.
Things I hate about eBay;
Sellers who are just plain ignorant, and who refuse to answer or even take questions. They go on my blacklist for any future dealings. It takes only a minute to compose and send an answer.
Sellers who think anyone and everyone outside the U.S. is automatically a scammer. 99% of people are quite decent folk, and our feedback must tell you something.
Buyers who want everything for nothing. I mean to say - we all like great deals, but trying to acquire something for 5% of its true value, is enough to make anyone snaky.
Buyers who stuff you around. Slow payers, non-payers. Non-payers get blocked permanently from bidding on my items, it's that simple.
The eBay corporation and its attitude. Arrogant, aloof, remote, and often just plain ignorant and unfair. Decisions based on what is best for eBay, not what is fair.
In my perfect world there'd be an official, independent eBay adjudicator or mediator, with substantial powers, to ensure eBay's decisions and treatment of buyers and sellers was fair, and above board.
Re slow shipping - I make it clear to buyers that I will ship within 1 business day, and give out expected, approximate delivery times. I make it clear that once in the hands of the shippers, I have no control over whether the item is in a cargo plane crash, a truck-trailer rollover or fire, and I can't be held responsible for the hairy, knuckle-dragging gorillas who use the parcel for slam-dunk games during their coffee break.