There are also times when the reserve funds, designed to get the show through the lean weeks prior and possibly just after opening, are depleted more rapidly than expected.
Some shows optimistically go into rehearsal undercapitalized. The prayer is that additional investors will magically appear. Some times said investors appear and sometimes they don't.
The post that says the answer is "money" is right. Closings are always about money whether the show runs one night or 20 years.
Insurance is taken on a show in case the set burns up, the star breaks his foot or some other occurance. There is no insurance for bad reviews and bad business. Would that there was...
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher