Since John Adams’s 1991 opera, “The Death of Klinghoffer,” opened last week at the Metropolitan Opera to street protests calling for it to be boycotted, it has sold more tickets than any other opera currently at the Met, company officials said.

But sales data so far suggests that the controversy and coverage generated by “Klinghoffer” may turn out to be neither box office poison nor box office gold: Peter Gelb, the Met’s general manager, said he expects the opera ultimately to earn 70 to 75 percent of its potential ticket revenue, about average for recent seasons.

Advance sales for “Klinghoffer” were weak, as some opponents of the opera — many of whom had not seen it — charged that it was anti-Semitic. At protests outside Lincoln Center, several speakers likened it to Nazi propaganda and called for a boycott of the opera and, in some cases, the Met.

But sales picked up after the opera opened, and music critics weighed in on the piece offering an array of reactions. Critics from a wide range of publications, including The Wall Street Journal and The New York Post, rebutted the charge of anti-Semitism in their reviews.