A chef has a special dish with secret recipe, the dish is the reason why many customers come to his restaurant to eat. Families and professional chefs alike have tried to recreate this recipe, but it is never quite right, it always misses a little something.
If he gave away this recipe, he wouldn’t have a special dish, everyone would have it. The reason he has not shared the special ingredient, is not to do with his ego, he would happily share if he could. The chef does not share because he needs to pay the rent.