Patrick Healy gives the answer to the question of this thread in a new artsbeat post:
Short answer: The multimillionaire investors have been willing to cover the losses.
Longer:
"The reason? Its creator, the “Today” show host Kathie Lee Gifford, and two of the lead producers – Dick and Betsy DeVos, multimillionaires from their Amway family fortune – have been determined to keep “Scandalous” running in hopes that the musical will somehow rebound at the box office. While Ms. Gifford has not put her own money into the show to keep it afloat, the DeVoses agreed this week to cover the show’s financial losses for now, according to two executives involved with the show, who spoke on condition of anonymity to discuss private business matters.....While the two executives involved with “Scandalous” predicted that the show would announce a closing date next week unless there was a box office miracle, the executives also held out the possibility that the DeVoses may end up covering losses out of their deep pockets in hopes of finding a bigger audience among Christmas-season tourists."
Scandalous Producers Keep Faith in a Struggling Show