Turn eBay Buyers into Long Term Customers

Once someone's bought something from you on eBay, you suddenly have all sorts of details on them.

If someone's bought from you once before, then the chances are that at some point in the future they'll want to buy a similar item, and you can take advantage of this to market to them directly.

This will only be successful if your original customer service and product were superior, and will be even more successful if you over-delivered to them, by adding a bonus of some sort.