AEA AGMA SM said: "That's an overly simplified way to figure out running costs that doesn't take into account various non-fixed weekly expenses. Advertising, costs for promotional items for awards campaigns, weekly rehearsal expenses (understudies, replacements, rehearsal for promotional appearances, etc), or even just maintenance. Wardrobe, for one, is a pretty predictable weekly cost, but things like set and prop repairs, lighting maintenance, sound, etc can vary quite a bit week to week."
I see your point - but if I calculated the running cost based on the all-time gross, the investment, and the number of weeks, then the number I calculated DOES take into account those expenses, doesn't it? Because it's an average number across all of the weeks that it took them to recoup. Without those additional expenses that you mentioned, it would have taken fewer weeks for the show to recoup, so the calculated average would have been lower. It might not be an accurate representation of their fixed weekly expenses like rent and labor, but ultimately, shouldn't our estimations of running costs reflect those inconsistent expenses? The only expense you mentioned that might be considered an outlier are the awards campaigns, since those only happen once.