By using a popular email marketing system such as eMerge, you can establish a way to collect email addresses and market to those users. LeadPages will allow you to create landing pages that will be enticing for people, so you can use it to collect email addresses that you will eventually market to through eMerge.
It might sound confusing at first, but email marketing is definitely where the money is. The money is most certainly in the list, but it needs to be done the right way and you need to attract the right people first. Use your email campaigns to add lots of value constantly over time and watch as the results ratchet up quickly.