I think the better question is why do servers take a job/stay at a job with abysmal wage? The people who accept these jobs are in it precisely because of the tips, not the wage, and are complicit in propagating a broken system. Because when presented with the idea of eliminating tips altogether, these are the same people who will say "prices of food will go up", "i dont want a flat wage", "my monthly earnings will go down if my wage is flat, "i will quit", "i will be taxed more", etc .