Ebay can be tough but I'd suggest that 99.9% of the camera transactions there are good. I rarely buy or sell anything else there but have 635 transactions and only 2 that weren't quite right. In both cases, Paypal refunded my money.
The keys are:
1) understand the shipping costs. These are often inflated to offset a lower price.
2) KNOW what you are buying. Never buy anything from a listing that shows a "stock" picture only. If the seller is too lazy to take photos of what they are selling, move on.
3) The photos have to be detailed and sharp. These sellers who can't focus a P&S camera on the item. Then claim to have "taken thousands" of great photos with this lens for sale, are full of horse$hit. Also that the photos show the things you need to know. I could care less if they show a photo of the side of a lens. I want to see the aperture blades and the glass. I want to know the lens is scratch and oil free with light wear.
4) Check FB. If it's less than 99% then I'd move on. Most sellers would rather refund a sale than get a negative score. Those that get more than 1% unhappy are questionable and those at 96% or less are trouble.
5) Use this marketplace first. I moderate here and we see any claims. In my memory, we've had 2 bad deals in the last 3 years (at least reported). People don't want to be kicked off the forums over a sale.
6)
Always use Paypal and unless you know the seller very well,
never pay as a "gift" in Paypal. Gift payments have no buyer protections and there is no refund policy. That's why the fees are lower. Paypal is the buyers friend in most cases.
7) Know what the sellers return/refund policy is in writing before you say yes.
8) Research your prices. Get an Ebay account so you can see the past sales of any item you are interested in. Also check the major online stores.
9) Be informed and read every listing carefully. New stuff sells here and on Ebay every day. The hot item (unless it's an A*85mm f1.4, in that case just pay the guy whatever he wants) that was just listed will come again in a week or a month. Take a deep breath before you buy.
Last edited by Peter Zack; 04-11-2011 at 06:15 AM.