How to make $75,000 a year blogging

This is a little off topic for this blog, but I found it interesting. I was listening to Kim Kamando on the radio on Saturday and one of her discussions was on how to make $75,000 a year blogging. She had three or four points, but one of the points that stood out to me was that she said you needed a 100,000 unique visitors in a month. I manage a couple of internet sites on a daily basis and they don't get that kind of volume. It sounds like something I need to work toward.