At a fine dining establishment like 21, food and nonalcoholic beverages account for around 70 percent of total revenue because of the high demand for its outstanding selection of vintage wines, whereas at Outback it accounts for nearly 90 percent for the two items In addition, labor costs are unusually low compared to those of other industries.. This is because the jobs, with few exceptions, are mainly filled by younger lesser-skilled workers, and extra income generated by gratuities from customers can be a significant supplement to the base salary.