We had a local, single screen theatre try that for awhile. To start with, it was a huge drain on the owners' available time. As others have said, the money is not that great... and you have to work hard to get it.
Most of the films, if not all of them were "flat", or a fixed price to the studios. In the local case, that was the only way they could keep their costs down. The advantage to that is you know exactly what your film cost will be, regardless of how many people show up. The disadvantage is that the films were REALLY OLD, so not many people did attend.
So, yes. If you plan on something like $300 to $350 for an older film, once shipping is figured in, then your costs for rent, triple-net costs, utilities, insurance, payroll, taxes, business licenses, maintenance, advertising, and YOU... then factor in your $2 admission and $2 concession base (minus product costs), and you have what you need to get from your advertising community.
Do you know what that number is? If not, need to figure it out. Only then will you really know what you'll have to solicit from the advertising community. It could be an eye-opening figure. When you do get it nailed down, put that number on this board, and the other users here will have a far better idea of your chances for success.
An example: In my area, a "5 to 7 screen" theatre (are those screens in your place built right now?) can easily cost between $15,000 - $20,000 per month. For a 7-screen operation, each screen would have to generate nearly 3,000, just to cover the lease. A lot of sub-run theatres struggle to make much less than that. Add your other costs of operation, and that per-screen number can easily double.
If you book a film that requires a percentage payment, then you have to establish an admission price... IE, what each ticket is worth. That can't float around, based on how much advertising you attract. The studios will expect their percentage for each patron watching the film. You will have to figure out how to track that, especially considering that a checker could always walk in your door and count the number of people in the auditorium. That information goes to the studio, which will compare those numbers to your boxoffice report. A percentage deal will get you newer films, but in your case, probably nothing that's not on DVD, or very close to it... especially if you have any competition in your market.
If you can get all that worked out, and things still look good to you, the big question is, how long do you think the business community will stay interested enough to support your plan? They don't usually spend money on advertising, unless they feel there's a return on that expenditure. Your customers will have to make purchases, based on their exposure to those ads. Considering the very deep discounting you're doing, are these people likely to be the ones your advertisers are looking for? If response isn't up to the advertisers' expectations, they could eventually drop off and you'll be scrambling for a new business model. That's what happened here, and the theatre eventually closed (again).