Hi John, I've been selling and buying on ebay since 2000. I find since opening a Paypal account I no longer have to wait for payment to come through the mail. Ebay members with 100% feedback usually will pay for items immediately, so you really need to provide the same consideration by having the item packed,labelled and sent out in a timely fashion. I always print out the buyers address including fragile labels then cut and tape them to the box, to ensure the postman has no excuses about legibility and doesn't punt package like a football. If your sending an irreplacable big ticket item get a tracking number before mailing, if buyer does not want insurance, then make it clear your not responsible if it shows up in a milllion pieces. I'm so picky about my packing to ensure a damage free delivery, that if the buyer doesn't want the insurance I'm usually not concerned. Never had anything damaged in transit.
When buying items the plus about using paypal it helps to ensure that you will receive the item quick in most cases.
Some dumbass's on ebay feel they can take the opportunity to make a profit off shipping costs, you need to be leery about these individuals. Ebay prefers the shipping costs to be already present before hand in the auction, sometimes this is not possible especially when shipping cost is determined by the weight, size and the distance required for the item to reach its destination. In these kind of senario's(like up here in Canada, no flat rate shipping) one must clearly state that the shipping needs to be determined based on the buyers address, and at the end of the auction please do not pay till I have forwarded an invoice because my shipping is not free. Trust me if you don't have that in big red bold letters, buyers will send payment for just the cost of the item. When selling car parts you know as well as I do, people that own muscle/ classic cars are very particular about stuff they put on their cars, try to describe the item as precise and clearly as possible so the buyer has no suprises. Its important to maintain a 100% feedback rating, then other members will trust that you responsible, reliable, fair, honest and so on.There is alot of times where members have received negative feedback when it was not justifiable, for example slow shipping, a majority of the time this is the postal service's problem not the seller. Canada Post or U.S.P.S are not consistent, if item has to travel across the border then it needs to pass through three sets of hands(post office, customs, post office) Make it clear to out of country buyers to have patience inregards to waiting for the arrival of an item of the exact reason I just mentioned. Some countries you will want nothing to do with, the majority of the people I buy from and sell to are Americans and Canadians. I have shipped overseas before, but its very expensive, especially by airmail.
For the 10 years I've used ebay, the only problems I've had(not to often) is with the odd individual that has a very bad attitude problem, nothing to do with the transaction itself, just people that are born to be A-holes. I'm not hard up for money and will not take crap from anyone if its not justified, for that reason I've had to refuse to sell to people like this or even refund their money and unfortunately not complete the transaction.
O.k I will shut up now, hope I provided a bit of insight.