My beer cost is the biggest variable.... Cheap beer is cheap, IPA is cheap, Bourbon barrel aged stouts can add up quick. Tricky question yet very good as we all improve/impress, it can lead to these requests. The things that we normally neglect to think of do add up. Example: wood, electricity, use and abuse of gear, vac sealing, seasoning, flavorings, sauces, gloves, foil pans, washing, sanitizing, serving. Stuff really adds up. Especially as size of party increases.
To me, I enjoy the prep and cooking but it does eat up my time and a lot of stress. I LOVE cooking but would never want it as a business. I feel the same way about fishing. Never wanted to turn passion into work. I teach. I do not go to work. I go to school. Mindset is key. Dang that got long.