OK, every one of us has thought ' how do sellers get the most money for their items?' and 'How do I as a seller get lots and lots of money for my stuff?'... here are a few  tips I've learned from experience selling on eBay

1. Use every letter you're alloted in your title. You have 55 letters, and you can fit a great deal of information within those letters. Here are two examples of titles-   New DVD Box Set Real World 10 New York NY MTV   (That was a mere 45 letters, by the way) OR    DVD Real World 10 Set     The first title has more information- and when keywords are entered in a search, the buyer will more likely find the first item. Don't waste time using words like 'cool', 'nice', 'lovely', or 'beautiful'. Few people search for those kind of words. They DO search for 'Rare', 'New', 'Lot' and similar words.
2. Research. Figure out exactly what it is you're selling. What year is it from? What is the country of origin? Only by research can a seller make sure he starts bids at a fair price. You can search in a library, or on eBay or online search engines. Some items, like jewelry or automobiles, can be taken to an appraiser.
3. Take good pictures. You want your item to be taken on a simple or plain background to make it stand out. Make sure the colors are pretty accurate, and that the photo is in focus.
4. If an item is rare or one of a kind, say so in the title and description. If it's not, don't say it is. If you have a hundred of the exact same item sitting in your house, they are inherently NOT one of a kind.
   
5. Don't bamboozle. Never knowingly decieve your buyers. They will figure it out pretty quickly, your feedback and sales will plummet.
   
6. You should always explain condition of an item. If it's used, or has a hole, or a crinkle, say so. Maybe take a picture. 'Damaged Goods' still sell, some quite well- often a buyer may know how to fix the problem with an item, or may simply not care. I've sold items that were in less than perfect shape for high prices, sometimes because buyers say 'I don't care that it's broken, I had one growing up, loved it, and then my mom threw it out.I HAD to have it, even if it wasn't 'perfect' '
7. Sometimes bells and whistles work. Subtitles, gallery photos, additional photos- it can be confusing and costly to list an item. Some items- a car or boat, a dollhouse, a rare baseball card, a hand-knit sweater... bigger-ticket items are going to sell for more money, so a few additions to your listing won't cost you much compared to how much money your item will sell for. If you're selling small items for low prices all those additions are pretty unnecessary.

Thes are a few things that have worked for me, but everyone's experience differs. Hope it helps