1. Include your ebay seller name, store, and website information with all items you ship. THis can encourage re-orders and help the buyer leave feedback. I remember one particular incident, as a buyer I wnated to reorder a product from a seller but I couldn't remember their ebay seller name and so never reordered the product.
2. Email customers after you have shipped their item to ask them if they recieved the item and if they are pleased with it. This not only builds trust by showing you care but also gives you the opportunity to add a link to your recently lited items on ebay or your website in your signature line.
3. Put a subscription box on your about me page to capture email addresses and follow up with visitors with news about your products, industry, sales you may be having, product information and inprovements, specials, etc.
4. State in all your auction listings that customers can save on shipping costs by bidding on multiple items at the same tim. Include information about other auctions you have listed at that time that may be related to the product in the auction. Try to link to the items and open the page in a new window so the bidder does not lose his place. Use a picture of the item to encourage bidders to look at your other items.
Many people use an auction listings gallery which inserts pictures of their other items into their auction descriptions like the the one at andale.com.
5. Try to add bonus items to your auctions where applicable to encourage bids. Free ebooks, extra ad space (if you're selling ad space), free software, free samples of related items you sell, coupons for free shipping of the next item the bidder wins, etc.
There are several ways to skyrocket your earning with your auctions, be creative and you're sure to see a difference in your bottom line.
Jennifer Parks is the author of Selling on Ebay Now with free information, software, resources, and secrets for selling on ebay.