Final answer:
Marty realizes that the most important thing about home is how it feels, not how nice it looks. The least important thing is how expensive the home was.
Step-by-step explanation:
Marty realizes that the most important thing about home is not how nice it looks, but how it feels. He understands that a home should provide a sense of comfort and belonging, regardless of its appearance.
Marty believes that the thing that matters the least is how expensive the home was, as long as it feels like home.