Except for those rare one of a kind deals, it is a situation you can easily avoid. Do be patient and look around. When browsing , don't jump on the first thing you see. Chances are that whatever it is that you are interested in or looking for, there is more than one that can be found on eBay . Never place a bid until you are absolutely positively convinced that the item is exactly what you want.
People like to see and touch what they are buying.
Since touching is a bit unreasonable for the Internet, seeing is made even more important. If you are selling an item, make every effort to post a picture of the item . Over time, it has been shown that items with available pictures tend to attract more bids. Be courteous at all times. Rarely if ever, do rudeness and attitude develop into positive results either for the seller or the buyer.