Are email lists still profitable? Do you make any money with an email signup list? If so, I’d love to hear from you!

Here is what I have been thinking…

Take a niche, say “car maintenance” and they build a 7 day course around “7 ways to better care for your car”. Make an email signup form and send 1 tip a day for the 7 days. Each day would like back to a page on your site for more information, and that page would have Adsense and/or an eBook or some form of monetization.

Anyone do anything like this? Would it still work?

Here is an example of what I’m talking about:

Digital Photography Course

What do you think about an idea like that?