These are the words that the search engines will base the matches upon. Complete information will result in more hits for your auction. A great resource has been created by a good friend of mine, Mike Clark. He maintains the Super Seek Help Desk , whuich I recommend as a great starting point for promoting your auction. There are so many other places to advertise your auction, and most people overlook them.
More traffic means more sales.
They cannot buy from you if they never heard of you. The bottom line is link, link, link.