Nine shows

Her Loud Tour may not be selling in the United States, in Europe it's a huge success. In fact, it's such a smash hit, Rihanna has added show number nine to her already impressive eight show run at the O2 Arena in London. The show is already on sale, and apparently is selling just as well as the first eight did.

What's wrong with the American fans? Why aren't they buying any tickets?

Update: The ninth show at the O2 Arena is sold out by now! Well done, Rihanna!