And of course, you assume you would be one of the masters, not a slave or one of the mooks who get weeded out…
The deadliness of the Agoge and the need to divert a very large chunk of their forces to keeping the Helotes oppressed actually left Sparta very low in manpower, and even the loss of a few hundred hoplites was devastating. The total mobilisation and reglementation left Laconia culturally stagnant. When new tactics were developed, the rigid and overspecialised Lacedaemonians were easily defeated and left irrelevant.
Ultimately, Sparta is no less than the exemplary example of the folly of militarism and totalitarism.
You glorify and fetishise hierarchy, authoritarianism, obedience, elitism, callousness, exploitation, oppression, violence and death. You are an advocate of all that is wrong with humanity, that ancient and ever resurging ideological sickness that we nowadays call Fascism after its most devastating incarnation. But in reality, it is freedom, openness, equality, justice, compassion, peace and cooperation that allow humanity to truly prosper. I am a civilian through and through, and proud of it. Even if it was not my patriotic duty as a German, rebuilt greater than ever before under liberal democracy after being reduced to rubbles by Fascism, you and your ilk would still be my mortal enemies, and I would still oppose you as long as I live, and I would still teach my children and the next generation in general to do so as well, so that your vile Evil may never rule again.