Because they might win the lottery!
Or because they're sure that the oligarchs that picked this country clean having started in the 80s will whip their dicks out and start raining down golden showers of prosperity like they promised they would as long as we gave them all the money half a century ago.
The peasants have been too deluded into the false hope that they'll one be the fuckers in this rigged system one day... so why tear down the system that's beaten them down, when it's their turn any day now to kick all the fuckees when they're down like they were?!
TLDR snake oil salesmen never went away, they just took over. That's why we don't rise up. The vast majority would have to see through their obvious bullshit, and that's too much for some, as they'd have to admit to themselves that they fell for it first. The sunk cost fallacy.