OT, but all the talk of budgets and marketing costs - info that, even if we had it, could be incomplete as studios often try to hide how much movies actually cost (or don't), reminds me of one of those stories from Paramount Pictures, sued by Winston Groom, the author of "Forrest Gump." Once "Gump" passed the $300 million box office mark, Groom inquired as to when he may receive his 3% on the net stipulated in his contract. He was given a lecture about how Forrest Gump actually lost $62 million.
There was an out of court settlement.
Depending on the production, the sort of publicity a studio wants or does not want, budgets can be inflated to seem more important, but more often than not, studio accountants try to artificially inflate the budget by every conceivable dime, because then they only have to pay people whose contract stipulate a cut of the gross. Even then, a really powerful and savvy A-lister should fight to get a piece of each ticket sold, regardless of gross OR net. I don't know if it's been tried, but it oughta be.
Truth is, not even much of Disney's accounting staff will ever really know how much Tron made (or lost), but the fact that there's been no serious talk of a sequel doesn't bode well. I'm not saying it won't happen. But if I were a diehard Tronnie or whatever the hell they call themselves, I wouldn't hold out hope, so if it happens, it would seem like a happy surprise.