Rihanna can never have the same number in sales, because people are mostly interested in the visuals with her. Rude Boy for example has had millions of views because she is dancing in a suggestive way and she also has many other videos that are very sexy so people who would not buy her music or go to her concerts sit at home and watch her on Youtube. Its pointless really as she herself knows why her videos are popular and thinks it will generate sales, but in some cases it works and in some cases it does not work. The millions of views does not equal millions of fans as I know guys who hate her voice but don't mind watching her on mute.