They don't save because they don't need to since there's always a job available as hiring is so easy. In Europe we need to save in case we want to quit, since then we lose all rights and protections and need to wait months before finding a new job.
It costs loads more to be poor than to have some money. You won't save money by buying up-front, if your credit is low you'll pay more than a person with more money, you miss payments and the late fees rack up, you overdraft and your fees add up, you can't go on autopay to save money because you risk going into overdraft, etc.
Maybe if the 1% didn't own 50% off all the resources (money) than poor people could find some money to save.