The situation are as follow:

• You might not want to follow everyone. Imagine the mess your main timeline would become.
• You can only create list of peoples you followed.
• Although they might say “there’s a list for that”, some list are terribly personal, best bet is that you’re the only one who would make it.

Considering such points of inconvenience… it might be a nice idea to have an extra account, follow all those peoples related, and then create lists. Yes, account made to host lists of those newsmakers you might not want to bother following officially yet nobody else make list exactly as your requirements. Then subscribe to them from your real account.

So that be:

• List account, follow probably hundreds or thousands of peoples.
• Main account, follow peoples you’re actually interested enough, and subscribe to the lists from list account or other users.

The list account wouldn’t just benefit yourself, but also others. Example case, providing list of Twitter users in your community to others who don’t want to follow each and everyone but still need a convenient way to view their updates in single place..