6. Lady Gaga
Mother Monster kicked off her Born This Way Ball in April 2012 and will continue touring until March 2013. Lady Gaga sold out all 65 of her 2012 dates, earning $124,879,545.
Since there are other opinions besides my own, oddly enough, you may want to check out what other people think or how they visualize the world. That's what this site is for. I've compiled lengthier articles that I found to be particularly interesting, insightful or entertaining.