I’m a buyer, not a seller. Here’s what I like and don’t like:
I love good pics and detailed descriptions. I can’t handle the object before I buy it, but I do like to know what I’m bidding on. A picture and/or description of a flaw will make a good impression on me, I’m going to think that the seller is honest. I like fountain pens, and will bid on some of the cheaper ones. However, if the seller leaves out what I consider basic information, such as the width of the nib, I’m likely to simply pass on that auction rather than ask a question about it. Descriptions should tell me why this particular item is worth buying. If the seller says that the nib isn’t marked with a width, that’s all right with me, at least the seller is giving me whatever information is available. Tell me the truth, and I might select you as a favorite seller.
I don’t particularly like boilerplate disclaimers (such as “All of our items are used and sold as is”) but I understand the necessity of them. I do read them, and if they seem reasonable, it’s a point in the seller’s favor.
I don’t use PayPal. I just don’t trust it. I can send money orders or checks with no problem.
An outrageous shipping price will guarantee that I don’t buy from that seller. I don’t mind a little extra for handling charges, but if I feel that the seller has put a high shipping charge to avoid paying eBay fees, I will think that the seller is basically dishonest, and won’t buy from that person. And while pictures, as I said, are good, if a listing has ONLY a picture and no description, I’m unlikely to buy. I hate L(O)(O)K!, LQQK!, and similar gimmicks. I usually won’t even click on any listing that uses such gimmicks.
Sounds on an auction page are evil, unless the item is a CD or something. Blinking images are also evil. And if I can’t read the page without straining my eyes, I’m not going to bother. Just put black text on a white page. Don’t use every HTML/XTML trick you know. It’s not going to impress me, it’s going to aggravate me and I’ll hit the BACK button as soon as it loads. I surf with FireFox. This will handle most pages, but it won’t handle everything. Again, black text on a white background is safe, even if you think it’s boring.
Remember, someone else is probably selling the same item. Don’t irritate me, or you’ve lost the sale.