As we discussed earlier, using Extended Circles makes your posts visible to all the people who have you in their circles and all the people in their circles.
If you have built your Following (people who have you in their circles) up to a thousand (as in our example), then that can easily be over 100,000 readers. Newspapers, magazines, and big websites spend megabucks to get that kind of readership, but it is yours for free on Plus.
However, the problem we have is this post is among thousands of others whizzing by in the public Stream. If someone has several thousand people they're following, then whizzing is the proper term. Articles come up and before you can finish reading them, others have pushed it out of sight.