A lot of these arguments only apply when going to a buffet restaurant. If you're going to a normal 'a la carte' place then you only pay for what you order. If you order 4 meals, say, for 5 people because 2 are going to share, they don't then add on a charge for the meal not being ordered. In the same way, they wouldn't charge an adult price for an adult (or child over 10) ordering a meal from the child's menu.
Quite honestly, if you're doing DVC and don't get/qualify for
free dining, why pay OOP for a dining package? As you say, only 4 out of the 5 of you will actually be able to eat anything, and why pay unnecessarily for a 5th person when they can't eat anything? If you pay OOP for your meals, you will have total flexibility on what you order - including only having an entree if you don't want a dessert (I'm always too full for a dessert anyway), or you could order an appetiser and a dessert and not order an entree at all. Plus, if you just took the 5th meal to go, you're also paying a totally unnecessary tip, remember!
On paper, paying for the
DDP has never worked out cheaper for us - even when eating at TS restaurants.
There is no question of a non-eating person taking up a seat that an eating person would use otherwise! That's saying that we, as a party of 3, would be charged a surcharge for 'wasting' the 4th seat on our table! That just wouldn't happen. Hubby and I have been sat at tables for 4 before now as that was what was available when we were next on the waiting list!