Normally, I agree with what you're saying and would never do it myself, but I can think of several debate threads on this very topic where a good amount of people stated they had no issues self-parking at the Contemporary for a breakfast ADR and just walked over to the Magic Kingdom after that. Everyone told them how wrong it was, that it wasn't allowed, etc. but apparently it is permitted more often than one thinks. I don't think it's right at all, but if a CM allows it then what can you do.