"Sunset Boulevard" is a unique case, though. It's been reported over the past 25 years that what kept the show in the red was the fact that he was paying two stars (Glenn Close, Patti Lupone) an enormous salary at the same time, with both salaries coming out of one box office. If he didn't have to pay off Lupone during the Broadway run, then the show would have been a financial hit. Again, don't know if it's 100% true - but it's been the general consensus from what I've read for the past 20+ years.