There are two breakeven figures when it comes to shows:
Weekly - a show has to gross a certain dollar amount to meet its weekly playing expenses: rent, salaries, royalties, etc.
Capitalization - which is the amount the show cost to open. Any monies over and above the weekly nut is operating profit and goes toward paying off the show's capitalization and once it is paid off, those monies become profits.
Kiss of the Spider Woman played mostly profitable weeks, but there were not enough weekly operating profits to cumulatively pay back the show's capitalization even after 2+ years. It is possible to play months and months at a weekly profit and still close at a loss. In fact it seems to be the norm these days.
Also Livent had a creative accounting scheme that while interesting and different was transparently a case of mis-stating assets. A show was not written off until it had closed for good. I wish I understood it enough to be able to recount the practices, but I can't.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher