Once you have a buyer on eBay it's vital that you keep that person's name and address and look for additional items to offer them later. Research shows that around one in five buyers ultimately become regular buyers. This happens in mail order, on the Internet, by direct mail, and on eBay.

This means if you don't follow up on past buyers you're effectively losing out on 20 per cent more profits at every marketing opportunity.

Imagine you sell an eBook on eBay, about making money in the property business, for example, and you sell one hundred copies each month. Over the year that's 1200 customers. Of that number 240 are potentially regular buyers of similar or even unrelated products.

Now let