Not at all the case. When you can't afford to buy that house in Newport, Rhode Island, shoot for an apartment. Can't afford the apartment, either? Two options... rooming house or crowd renting.
That's what they all say.
Unless the parents happen to be spoon fed invalids who can't be left unsupervised and the live at home kids have overtaken the entire operation from getting every single bill paid to keeping the house in good repair, that excuse doesn't wash.