Having spent 20 years running hotels and restaurants ( not any more though) I frequently looked at are books and wondered how we made any money at all, Salaries running at 38% of income, rates, water, equipment ( how do you fancy a new sewerage system @£138,000 and the customer never sees that ) painting,gardens , fire systems checks.
If you want to make money in catering get a Mac Donald’s franchise if not and your doing things because your passionate about doing things the right way then forget it.