A sure way for a business to fail is to tell customers they are looking at things wrong. Especially when the customer's viewpoint is based on straightforward logic. This is why most restaurants are not heavy-handed when it comes to enforcing this type of rule. Sure, if a group of 4 adults all want to order a kids meal, most will enforce the rule. But one? Certainly some will still balk, but they are also the ones who wonder by some customers don't come back. And in Disney's case, they are still making a tidy profit on kids meals. With all the other price increases and service cuts going on around the parks/resorts, does it really make sense to squeeze a few extra $'s out of people who don't want to order more food than they can eat? I guess this type of decision is at least consistent for today's Disney, and of course they can do whatever they want (within the law), but there is no way something like this is any kind of significant net gain for them, and it may even be a net loss. Its just the spreadsheets only show the theoretical short term gain.