Ebay Feedback

at least 99.5%

It depends. Best to click on the feedback # to get to the detailed feedback page. Take a skim through the first couple of pages to look for 'false positives' as sellers are not allowed to leave explicit negative feedback. You can also click the # next to the negative feedback score to filter and see just the negative feedbacks. You also may get somebody who has a high feedback score but hasn't been active on ebay in the last 12 months so their positive feedback percentage is 0%. It's better as a buyer as long as you stick to the rules, pay through Paypal, read the details of the contract you are agreeing to and ask any questions to get clear answers in writing before buying. In those circumstances Paypal's got your back. As a seller, not so much.

Depend the amount of sold products. If more than 5,000 a feedback of 98.5% or more it's fine. If few items sold, I'd say 99%.

If it's less than 100% look at the negatives and judge for yourself. Some buyers are just idiots.

I like to read some of the negative feedback and look at if they all say the same thing like "Item not as described" or something.

To be completely honest, I never look at feed back ....
As long as ebay allows sellers to give feedback after the buyer it really is not a true indicator.
Most sellers block people who give a bad feed back..... try giving one of the bigger sellers on ebay a bad feedback and you will see, I am blocked from several coin sellers because I have not given a 100% + feedback
Most people are so afraid of getting a bad feed back they will give a + feedback just to stop the seller from blocking them, ( asyn, little debbies, etc. )

To fix the problem ...... there is no answer,
Some people are never happy as buyers and some people will never get caught as bad sellers out of fear from the buyers.

But as an after thought,
I don't believe I have ever spent more then 4 or 5 hundred on a single buy from a new ( to me ) seller.
Same old same old ....buyer be aware

Numismatic Items. To be honest, I actually have experience dealing with non-numismatic items on ebay.

Well I know most buyers don't read! I've had 4 buyers in the past 2 weeks, make offers on my listing where both title & description say pick 1 only. I accept the offer they pay. When I send an message as to which one they choose. They reply its for all 4. Since they've already paid, I'm faced with having to issue refunds, and submit a cancellation request. Yet I've had other buyers who understood the pick 1 idea. I've also had a buyer own up to his mistake, and stand behind his purchase. I put in my ads to contact me prior to purchase, too see if your choice is available. I gets frustrating when this is a repeat process, and only with the French speaking population too. The misreading, always involves someone from Quebec. Well I guess 1 benefit is with Solds on a multiple listing, it gets brought up more often in search results, as it's partly how the new ebay search works.