How easy it is to ignore the fact the that the people who created this movie need to be paid.
They're paid for services rendered at the time of completion.
Not only the actors, writers, directors but the hairdressers, electricians and even the computer special effect workers.
All these people are paid just like you would pay any other contractor. They do the work, you cut them a check. They all work for a set, specified rate, not for any cut in the profits. Those who do earn based off ticket sales are usually A-listers with enough clout to negotiate for a cut of the gross, not the net. So no matter how poorly it does in the box office, these people still get a cut of whatever it brings in.
And God forbid that investors who fronted the money in the hope of a return on their investment should realize a profit.
ANY investment prospectus will tell you that "All investment carries some degree of risk." This means that when you invest in something, yes, you expect a profit. But you also have to accept the possibility that the money you put in will go up in smoke. By your logic, I should be able to sue whoever I invest with if my mutual fund doesn't give me a 500% ROI. They decided to invest in something, they knew it was a risk. Lets not forget that the investors are going to be the LEAST damaged by any of this, since one film is simply a line-item in their ledger.
That being said, downloading films in this manner IS ethically questionable. Mass downloading can make a studio earn a reduced profit. But reduced profit is not a monetary loss. The real loss is that if the profit reduction is large enough, they have less incentive to produce any more films that require actual effort. The more this happens, the more you get dreck that caters to the lowest common denominator (such as The Expendables whose mass downloading furthers the cycle), and filmmaking is reduced to an exercise in formulaic cinematography to maximize monetization and merchandising paradigms (and other such buzzword-y bullshit). THIS is the real cost of mass copyright infringement - an art form reduced to a paint-by-numbers affair where no one dares to make anything truly unique. And to me, this cost is far, FAR worse than any perceived monetary loss.
At least the Capitalists who wish to to profit from the labor of others paid for that privilege unlike simple thieves.
How many times does it need to be said that COPYRIGHT INFRINGEMENT IS NOT THEFT?. Theft is the taking of something tangible which deprives the individual owner of its use. Downloading a copy of some bits does not deprive the original owner of said bits. They still have them, and can still use them for their intended purpose.