So, the picture I've gathered of Sparta over time in this forum is that actual citizens were essentially a leisure class, rich enough to hold slaves and estates and not really have to do any practical work. What sort of upward mobility was there in this society? For example, in Rome an Equestrian could potentially become a Senator over time. Could a non citizen of Sparta gain enough wealth to become a true citizen? How difficult was this process?
/u/Iphikrates talks about spartan citizenship here (in the context of its decline)