The words you select to describe your item will have a tremendous impact on final price it receives or if it receives any bids at all. This is because no matter how great item is you have up at auction, if you use words that don't lead prospective buyers to it, no one will ever see it. You have a total of 45 spaces to use for your auction headline to get people to visit your auction, so it's extremely important that you use each space wisely.
The vast majority of buyers search through eBay listings by entering item they are looking for into eBay's search engine. The main auction search engine only searches for words listed in auction titles. If a person selects a word that isn't in your auction title, your auction won't come up as a result of their search.
This means that by far most important task you have when composing a title for your auction is to use words that are relevant and specific to item you are listing. While this may seem obvious, a lot of sellers don't do it (in fact, searching for listings in which people have ineffective or misspelled titles can often get you some great items which you can resell for a profit).
If you are going to spend any extra time on your auctions, thinking through best key words for your title is where you should spend that time.
With a limit of 45 spaces, writing everything you want in title just isn't going to be possible. For example, say you have a complete set of four bobblehead giveaways, sponsored by Mountain Dew, that Minnesota Twins gave away at select home games during 2002 season.
Although accurate, that description is way too long for allowable number of spaces. The key is to think through an accurate description that includes everything and then taking most important words out of that and using them.
A simple title might read "Minnesota Twins Bobbleheads". However, that title would be ineffective because it isn't specific enough. While there are many buyers who are looking for Minnesota Twins memorabilia and bobblehead dolls, categories are too large and your auction will be lost among all listings. You will have a very limited number of people who will ever see your auction.
A better title might be "2002 Complete Set Minnesota Twins Bobbleheads". This title uses every available space and gives a specific description of what you are selling. It will also now appear in results for a narrower search.