Yes it does work both ways. Although it has been my experience that most terms adjustments after the run have been in the exhibitors favor. The only company that I have found that makes a regular policy of asking for higher terms is Miramax. As a matter of fact, I find it difficult to get them to quote any terms at all before opening a picture. The answer I often get when asking for terms is: "I don't know, we'll settle that later". Often when the payment is due I will call and ask for the settlement terms and will be told to just send in something on account as we don't know yet what they will be. Most settlements are based upon past performance. If you paid 50% on a $5000 gross before, then they will accept that this time, but if you grossed $6000 or more this time they will want 60%. It varies from theatre to theatre depending upon your grossing capability, and what that theatres average grossing history is. As you either build up your business or loss some of it to competition, you can over a period of time prove what is just average business and what is excellent business and get your settlements adjusted accordingly.
Warners is a firm term company, yet with subrun I will often be told that terms are firm and will be 50% for a big picture, only to receive the confirmation quoting 35%. When I send in 35% the cashier will call to remind me that the terms were 50%, at which time I will tell him to check the confirmation which says 35%. He then accepts the 35%. I believe it's a case of one hand not knowing what the other hand is doing.