1. Link Sales: This is the prime purpose for which directories were build. You can sell reciprocal, regular and featured links to your customers and earn money. But to earn, higher incomes from directories you need to get high Page Rank. Once you get it, you will see the cash start following in.



2. Advertisement Revenue: Advertisement revenue have always been the biggest source of income for webmasters. Free Directories often get a huge amount traffic and this traffic can be converted to cash with the help of advertising networks such as Google Adsense. By Free Directories, I didn't mean all the links are free, I mean you are making regular links free of cost.

3. Expired Domains: I told you about expired domains in one of my recent posts and directories can be a good way to have an eye on the expired domains. If you have a popular free directory, it will be pondered with hundreds of links every hour and many of those links gets expired after few months. You need to locate these domain names and captivate on them by running a Validate links script on your directory.