Most people will sell whatever they can on eBay as long as they can make a little extra money (and sometimes, even if they can’t). But if you follow the strategy of selling anything and everything, then you be playing the low price game of dealing with razor thin profit margins simply in order to get your items sold.
However, there is a way for you to boost your profit margins, and that is to specialize in a particular line of products.
Whatever area you specialize in, whether it be iPod cases, food dehydrators or exercise equipment, you can position yourself as an expert in that area. Best is to choose an area that you have some knowledge about or interest in, or that you don’t mind learning about.