That's the point: why would you ever waste your time farming for a carrot and potato, then hunting for meat, all so you can create one meal to heal for 15%, when you can find bandages by the dozen or buy them cheap, which heal for 25%? It's literally a waste of time. Same thing for the potion: it heals for what, 80%? except if you took all the resources it takes to brew one and sold them, you could probably afford more than four bandages, which would heal 100%. Or you could just take the time it would take to gather all those ingredients and instead farm bandages from goblins or something.