Owners don’t want to charge more for the food that people eat at Restaurants fearing it will tip the scale and less people will eat there, so they lowball the menu prices, and leave earning up to each individual server for each individual table instead of paying wait staff a living wage. This is further exacerbated by serving staff being allowed to be paid far less than the meager minimum wage in most, but not all (CA) states.
this is where the art of bullshit … managing expectations, comes in handy