At issue isn't what theatres can afford. At issue is that fact that theatres are obsolete. At one time they were they only place where one could watch a motion picture and the only place where one could enjoy an air conditioned environment. Today most most people that could otherwise afford to go to the theatre have home entertainment systems and other amenities in various combination that are a match or better than the experience offered at a theatre.
The improvements that can be made to the video and audio experience are logarithmic relative to the cost. Today for less than $2,000 you can purchase home theatre equipment that rival commercial theatre equipment tens of thousands more. After a point, the visual and auditory experience ceases to be the determining factor. For most middle class families that point has been reached. Now other things come into play, cost, convenience, ambiance, comfort. With sticky floors, disgusting bathrooms, obnoxious or at least distracting people, IR cameras spying on you, for $30/person, it becomes a pretty hard sell.
Absent a system that includes a run-off election the reality is that a vote for a 3rd party candidate is a vote for the least preferred candidate. Unless the American system changes, voting for a third-party, particularly in the presidential election is the very definition of "totally f**king stupid." Protest votes give you exactly opposite of what you desire.
The only way to effect any kind of change in the American two-party system is to do precisely what Bernie Sanders did. He caused the democrats to add his causes to their platform. It's not an ideal win but it is a win nonetheless. Everyone making an anti-Hillary protest vote is voting against your own interests. It ensures that everything Bernie stood for, everything democrats generally stand for--in this case probably even what republicans stand for--goes the exact opposite direction. In my mind at least that makes you worse than the unthinking masses buying every bombastic line coming out of Trump's rectum.
Anyone can do any amount of work provided it isn't the work he is supposed to be doing at the moment. -- Robert Benchley