well, if you'd read the book I mentioned you'd know they were not all rich. The slaves in Sparta were meant to do the most menial of tasks so that the upper classes could train, join soicial clubs and have anal sex. Successful completion of the Agogae just meant that you had a ticket to the club. IF your family owned lots of land and estates you did well. some did not , and when the signal came wore a shield that was passed down through generations. Sparta's war with Athens was fought because the Spartans broke the cardinal rule , Don't enslave your fellow greeks. The Spartans who surrendered during the Ionoian war kept their citizen ship but lost their land , thus they had to start all over.