Value of other extensions of a domain:
You must be aware that Google is the largest and the most used search engine of the World. But do you know that it also owns more than 180 domains to serve a different search page in the local language of the visitor visiting the Google site. Google owns 189 domain names with the same word in all other extensions. Google lately acquired the .XXX domain name too. Visiting the www.google.xxx returns a page not found error but the whois record shows that the domain has been registered to Google Inc. There are also some of the most interesting Google domains in the list like www.google.ms and www.google.ie This is the closest that you can find Google to its biggest rival Microsoft (ms and ie may ironically be referred as Microsoft and Internet Explorer respectively but actually they are ccTLD of Montserrat and Ireland)
Coming to our point, when you hold a .com domain(s) and would like to extend your domain or company value to the toppers, you may decide to register your same domain in other extensions too. The main purpose of registering other cTLDs like .in, .us, .co.uk etc., is to load your Web page faster than ever to your visitor. This is possible if your application is configured in CDN (Content Delivery Networks), your application loads fastest to your visitor from the nearest CDN Server. All the static pages are loaded from the CDN server and all the dynamic pages are loaded from your server.
This CDN will save you much bandwidth, Resource optimal usage and so on. There are many CDN Providers in the market. Some are free. Most of them provide paid services.
An Example of Free CDN Service : Cloudflare
An example of Paid CDN Service : AKAMAI