They know that, they stroke their gun boners to that very thought.
Except the tyranny they're afraid of is someone coming for their guns, or "communism." But they don't know what communism is and aren't aware that the guns aren't the rights they're losing.
There's a critical point in wealth disparity where money begins to lose value. As the amount of wealth that can be extracted from the working class dwindles and the people who have too little find other ways to barter with each other.
Fun fact, we have already seen an early attempt at this. And while I think we're still a ways away, it's not exactly without precedent.