Wait, somebody else agrees with me on the internet being a mass hallucination?
Dammit, now I need a different psuedo-profound crackpot idea that nobody takes seriously.
In all seriousness though, things that don't really exist except as mass hallucinations are the most powerful forces in human life. Pre packages ideas, gods, the popular thing, laws, and whatever some pundit claims is the right thing to do, all stick in the minds of cabbages.
Religion is a powerful force, whether God exists or not, math is a set of rules we made up, but it lets us build skyscrapers, hell, the largest industry in the world is now the creation of software, and we build machines to do our hallucinating for us.