Reading the articles about the unexpected closure, I do think that Margo has a point about not being told the full story, but I don't think they're making it up either.
Assassins and Millie both gave the weak advance sales reason for their closure. Millie's statement mentioned that summer is a tough time on Broadway and they weren't convinced the show would make it. Reidel wrote an article a couple of weeks back stating that as strong as shows are now, most of their advance bookings for summer are through the floor. As much as I dislike him for his opinions, I will grudgingly admit he does always seem to be right when it comes to facts. It will be interesting (though I imagine disheartening) to see how the rest of the summer pans out. Also, I have been looking into an October/November trip to NYC to take in some theatre but I can't find a flight for less than £400. When you factor in hotel costs and so on, it's hardly encouraging to tourism and this may well be another reason shows are starting to suffer.
So to come back to my original point, The Normal Heart may not have been lying in giving the weak advance sales as their reason for closing. But in closing with four hours notice on a Tuesday night, they made it very clear they weren't giving out all the reasons for said closure.
Nothing precious, plain to see, don't make a fuss over me. Not loud, not soft, but somewhere inbetween. Say sorry, just let it be the word you mean.