I'd appreciate 1. General explanation of the recouping process, and 2. Application to the specific Spider-Man numbers (whatever those numbers really are). I will try. I don't know anything specific about SPIDER-MAN, but I can explain generally how it works.
Is the (so called) $65 million all used up, or is there some left still to be used? Could it really already be $70 million, and growing? After all, the show is still being developed. Every experienced producer builds a contingency into their original budget - about 10% of the overall budget is pretty standard. Who knows if these producers did that, but they definitely should. Of course, their expenses could continue growing until they are well past $65 million, but if they had any idea at all how to budget, they should stay at or under that number.
Also, the preview period is part of the initial capitalization budget, so the $65 million budget SHOULD include enough money to run the show for the whole preview period. It's entirely possible they knew they would have enough income during that time to offset their preview running costs, so they did not include it in the budget (or at least not all of it), but usually, it is included.
That means that any money made during previews is USUALLY profit (or, more accurately, goes back into the budget as more contingency).
And the $1 million dollar nut (whatever that means) -- I've not seen anybody actually acknowledge that number. Will it turn out to be closer to one and a quarter million? 1.4? 1.5? At this point, especially after running for a few previews, they should be pretty much settled on that $1 million number. Rehearsals and changes and any extra costs that happen during previews are NOT added to the operating costs - they are included in the capitalization budget. Of course, as they make changes to the show, costs can always go up, but I doubt they'd go up that much.
Finally, assuming, for example, a future steady $1,500,000 reported weekly gross -- what portion, part or percentage of that is actually available to be applied to the weekly nut? And is the remainder then applied in full amount against the production advances (ongoing paybacks to the pure investors)? As someone else stated, the operating costs (nut) are paid back before anything else, then whatever profit is left is split between the creatives and the investors (usually 40-60 until it recoups, but this totally depends on whatever agreement they made for this show).
Except for a relatively tiny amount built into the weekly budget, producers usually make NO money until the show recoups and starts earning a profit (unless, of course, they are also investors).
Someone can correct me on this, but after studying under and working for Broadway producers for the past few years, this is pretty much standard in my experience.
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