Advertisement sales of hit audition show “K-pop Star 6” is estimated to have exceeded 30 billion won (26.4 million), thanks to high ratings and its unique programming model, according to industry sources Thursday. (Yonhap)The sixth and final season of the SBS TV show, which ended its 20-week run last Sunday, opted for a unique programming model, airing two, back-to-back one-hour shows each Sunday. In between the show…