The idea of patronizing a movie, or buying a game, or buying a book or whatever simply as a show of support seems to be a fairly recent one, and it seems to have stemmed from the pro-piracy culture that emerged in the early 2000s. People who had gotten used to cheating their way to free entertainment started feeling bad that certain people they liked and wanted to be successful were being potentially deprived of their livelihoods, and started advocating paying for some of their entertainment as a way of "voting with your wallets". It came to be applied to entertainment that was willfully provided for free, as well, from PayPal "tip jars" on creators' home pages to the recent emergence of crowdfunding sites and Patreon.
And there are problematic aspects to that mentality. For one thing, so far it only really applies to one type of product. You can't pirate food, or electronics. If you want to protest the way Altria or Apple do business by not buying their products, you don't have the option of doing that without also depriving yourself of those products. There's a certain degree of sacrifice involved. But on the other hand we're definitely starting to see more and more people at least consider the implications of buying from certain companies beyond whether or not they want what they're selling. And ultimately, that's a positive.
Where it can potentially go wrong is people using it as a way to support people whose opinions they already agree with and punish those they don't. I'm very much against this idea. People need to be more indiscriminate in what media they consume, in order to become more well-rounded people. The webcomic Unshelved has a slogan that I think fits well here: "Read irresponsibly." I'm not saying everyone has a responsibility to go out and buy a copy of Hatred just to show support for free speech, or something. But if you're not actually going to get anything out of watching a movie, or playing a game, besides a warm fuzzy feeling from having your own opinions "validated" by a single person who happens to know how to make a movie or a game, have they really earned your money? The mark of a good creator is the ability to make people think, to challenge people's ideas about the world. I never felt compelled to buy Spec Ops: The Line, for example, because by all accounts it sounded like it would be really unfun to play, even if I agreed with the ideas behind it and thought Yager were mighty brave for making it. Never bothered to get Gone Home either, since I gleaned everything I could have gotten out of playing it from reading about it.
Creators aren't charity cases. (Except when they are, in which case you're welcome to make a donation without actually buying their product, if they're not too proud to give you a way to do that.) Billion-dollar movie companies and the multi-millionaires who work for them are definitely not charity cases. Buy things because you want to have them. See movies because you want to see them. Not just as an excuse to throw your money at people you like. That's something that both sides of a certain current issue in the gaming community can stand to learn.