Well, I know for a fact that neither Menzel nor Chenoweth were making $25,000+ per week. That was an inaccurate rumor spread by some of their rabid fans. The only people who have EVER made that kind of salary on Broadway are very established stars well-known nationally (usually due to film and tv work) -- Lane, Broderick, Jackman, Peters, Glenn Close, Neuwirth and a couple of others. That's it.
Menzel and Chenoweth are far from household names and are only famous to their obsessive teen fan base and to folks who read message boards. Mention either name to a random person on the street (somewhere other than in the Broadway district) and you'll get a lot of blank stares. And according to the show's lead producer, while he appreciates all the teen fan enthusiasm for the show and is glad they're enjoying it, teenagers only make up maybe 10% of the audience for the show. Teens are not purchasing $1.3 million worth of tickets every week (most are going for the discount lottery tickets). The vast majority of ticket buyers are adults who neither know nor care who's playing the leads (which is why Menzel and Chenoweth leaving the show had zero effect on the box office) and wanted to go because of they heard it was a big spectacle show about the Wizard of Oz.
The producers know that their show is the star, not whoever is playing the leads, and that they can cast whoever they want and pay them as little as they want and the show will still sell out. There's just no reason to pay some unknown (to 99.999% of the world) $10K when performers would line up for a third of that just for the exposure.
Without going into detail, it is my understanding that the leads are making in the $5K to 7K range. The originals made a bit more than that -- but nowhere near $25K or $50K.
"What a story........ everything but the bloodhounds snappin' at her rear end." -- Birdie
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"The Devil Be Hittin' Me" -- Whitney