You may want to restrict some of the content in your collection by making it available to ‘members only’. A secure members' area enables you to do this.
Having a members' area means that users can have protected access to (and take advantage of) all of your unique revenue generating features, safe in the knowledge that their account is password protected and secure thanks to a personal login facility.
A members area' also enables you to grow a community of loyal followers. Being able to identify your community in this way means that you can speak to them more directly, sharing with them the exact content and information they are looking for.