Penny and her friends are mad because they think their allowances aren't high enough. Now if Disney isn't setting the worst possible example they can possibly set through this episode (and this show in general), then I must be dreaming because this isn't a show (or episode) for kids.
They just stay out doors for a few days, protesting against their parents. Trudy is worried about Penny and wants to go out and get her but it appears that Oscar couldn't really care any less. Oscar really musn't like his kids very much. Another bad example for everyone.
This episode in general has slightly more depth than some, so I gave it a 7.5 as a final score.