Having a murphy bed in the studio is great not only for a family of 5, but also in families like mine with opposite sex, teenage step-siblings. Everyone gets a bed... No drawing straws for who gets the air mattress.
I bought enough points as a single mom for my daughter and I to vacation in a studio twice a year. It was all we needed. Now we are a Brady bunch family of 5 and there are too many new life expenses to justify adding on more points. I'd rather "live out of our cases" for 2 weeks a year and gain the extra sleeping arrangement than have a few drawers and an air mattress taking up all the floor space in the room.