I really think you need a free level maybe up to 100 emails or something. otherwise I'm not sure how you market this.

Also, a list of pages/projects within categories. And a way to sign up for updates of new projects/pages in categories.

So, if someone create a new "tech product" page I can get an update of that category(tech products) I might be interested in.

So, as your community grows you add more value.