While I agree with what you're saying, your examples don't hold up. Do you really think you can just pick up your phone and chat to Obama or the Pope about the weather? Of course not, their time is too important. You'd need to schedule a meeting long in advance to chat with them, and you'd chat about very interesting topics.
Why should my time or your time be any less valuable than Obama's or the Pope's?
Because, believe it or not, we're not all considered as important as the president of United States or the head figure of one of the most popular religions. Therefore, we're not all treated that way.
You might think that your time is as valuable as theirs -- and I'm not arguing either for or against it -- but the fact is that you would be a minority and the world doesn't work the way we think it should, but the way majority decides (or is led to decide). And the world's that way not just when it comes to phone calls.
Why should my time or your time be any less valuable than Obama's or the Pope's?
Do I need to answer it? Come on.
The gist of my post was that even the most important people in the world find time to talk, eat with friends and family, chat about nonsense or just watch it rain, let alone normal people.