Since its beginning, five million people have attended Ozzfest which has grossed over US$100 million. The festival helped promote many new hard rock and heavy metal acts of the late 1990s and early 2000s. Ozzfest helped Osbourne to become the first hard rock and heavy metal star to hit $50 million in merchandise sales. In 2005, Osbourne and his wife Sharon starred in an MTV competition reality show entitled "Battle for Ozzfest". A number of yet unsigned bands send one member to compete in a challenge to win a spot on the 2005 Ozzfest and a possible recording contract. Shortly after Ozzfest 2005, Osbourne announced that he will no longer headline Ozzfest. Although he announced his retirement from Ozzfest, Osbourne came back headlining the tour. In 2006 Osbourne closed the event for just over half the concerts, leaving the others to be closed by System of a Down. He also played the closing act for the second stage at Shoreline Amphitheatre in Mountain View, California on 1 July as well as Randalls Island, New York on 29 July. After the concert in Bristol, Virginia, Osbourne announced he would return for another year of Ozzfest in 2007.