Well, have a look at the basics. Take away load-in costs, Scenic costs and maybe - (though probably not) Marquee costs (because maybe most operating shows can keep most of their marquees) you have rent adjustment - what will rents look like once theatres are operating again. Will more than a year of non-payment suddenly disappear? Will this be forgiven? Doubtful. Then - full casting and rehearsal for most shows given the artist situation. A full advertising campaign and competitive ones, because each show will have to be fighting for limited dollars from scratch. Full rehearsal, bonds (what happened to previous bonds? Were they released or maintained?). If it is 50% of the original and not way more, I'd be very surprised. Having created and operated a few such budgets in my time, I would be surprised if shows can reboot at 50% of the original investment. Of course, allowing for time and inflation.