Training any new staff in any industry is a hidden cost; difficult to quantify. We know it in the programming industry as the spin up time to get comfortable in a given code-base - at least 6 months to be properly comfortable, possibly as long as a year to be fully comfortable. The owner of Books Are Magic in Brooklyn † worked to transform his little corner of the industry, reforming as an alcoholic and his restaurant to boot. His reformation lead to a healthier staff that went to bed early and treating themselves better as well. The owner paid for his staff to go to therapy and live better lives themselves. I don't know if its replicatable, or if lower staff turnover and happier staff makes all the different there, but restaurant/bar work is, well, horrible for the soul. It doesn't have to be.

† https://www.bonappetit.com/story/david-mcmillan-sober