I think voting with your feet only works in theory, because Amazon is well known to engage in abusive employment practices (including according to workers) and yet has a great number of warehouse and delivery staff and its founder is the second (?) richest man on earth. Many low paying jobs have high turnover rates because they can just use people up until they quit (if they even have that option) and then bring in an unemployed person. They have to incentive to treat their employees with decency.