Depending on the menu requested, prices won't be any cheaper than the fine dinning restaurant but the law of economics applies. However u get to have the luxury of dinning in the comfort of your own home plus personalised butler service if u are will to pay for one. From 2-30 people, the type of menu depends on the occasion and how formal the host wants to be. Usually the larger the numbers, the more casual it becomes. If u or your guests have no allergies, then the whole world's cuisine is your oyster. Usually I prefer to propose a sensible menu than to let the host become too adventurous, such that the theme for the event might be lost due to selection of dishes that do not compliment one course with the other.
People may forget the restaurant the were in, but they will always remember the pleasure of eating straight off the kitchen with a personal Chef experience.