There are a number of things that buyers can do to help protect themselves.
1. Always use eBay's own messaging system because then eBay can see for themselves what was said or promised during a correspondence in a dispute situation. If messages suddenly switch to email, cut and paste the email back into the eBay system.
2. Ask the seller if the item pictured is the one for sale.
3. Ask the seller in advance what the shipping will cost to your destination.
4. If practical, ask the seller for close up pics of the item out of it's box or packaging. That way, you'll know if the mail man is a scapegoat or not.
5. Ask the seller if he has the item in stock. Ask him if he can guarantee that it will be shipped by a particular date and make it clear that you will be asking for a refund by that date if the seller can not show some form of proof of posting (easily and freely available in all cases) by that date. You can tell the seller that the item is a birthday gift and it's no good to you if you haven't got by a mutually agreeable date.
If the seller can't offer reassuring noises in any one of these, reconsider if you want to bid.
I point blank refuse to leave feedback as a buyer until the seller does first despite any justification from the seller. I know some buyers give sellers hell but I don't. The seller's side of the deal is completed when the goods arrive in a condition that matches the description. As a buyer, my side of the deal is complete when I pay. I have to do that first before they even start considering their obligation. What I might say about the seller should not influence the sellers comments on me as a buyer if I performed my half accordingly. If a seller refuses then he just has to accept that neither party gets a positive. Frankly, any seller who is confident that his description is accurate and that the goods will match the expectation that he has planted in the buyers head, has little to worry about. As always, cross your t's and dot your i's all the way.
(edit) Forgot number 6.
6. Ask the seller if there is any damage not pictured or any other hidden "disappointments" that might annoy a buyer. If you pose a direct question like that, you'll know instantly with the reply if someone is trying to be a clever wordsmith with the description. Yes or No answers are good. Leave no wriggle room. Again, make sure the question goes through eBay's messaging system.
People put up items buy it now for 1 cent and charge 40- shipping, how is that right?
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That's eBay's problem. Do number three and there's no issue for you as a buyer. Assume nothing and take some time to read the description.