4 Benefits of Having Multiple Domains. I only use my branded domain name. 1) Google likes to see multiple websites on different domains, they will give you more credit for having more.. 2) The Google Authorship that shows in search results is also different depending on which domain and URL you use, they will give you more credit for having more.. 3) The author and article metadata that shows in search results is changes based on which domain and URL you use, they will give you more credit for having more.. 4) Having multiple domains gets your sites into more search engines like yahoo, bing etc.. than just using your one Amazon store or a single domain name.