Is this for your ezine? Sorry but your posting is not to clear, if so, I would suggest the problem as being because you're not really providing them with any content other than advertising. Obviously an ezine is techincally, one big hidden sales pitch, but you've got interact with them in order to keep them there and wanting to read more. If you don't they'll leave and you've got to interact with them so much that you can train them into buy whatever you want at whatever price point you're selling a product or service for. Let them into your world and not just about business stuff either, just be you with them, people have a knack for responding better to ezines/newsletters when they know the person sending it is "just as human as they are".