Oh wait, no, it doesn't work like that,
You might have missed this line - it tells you I was not serious about my first claim.
You say Noxians are Orcs of Runeterra in one sentence and that they aren't low on any resources in the other, you might want to check things you compare before you actually compare.
Yes, I heard about Ionia. But unlike you, I also read about Ionia and what happened there, let me - a proper Noxian aristocrat - educate you about the facts and history: Ionia was supposed to get plundered only because of Grand General Boram Darkwill's age and agonizing fear of death. He wanted us to just steal and bring anything of magical might that could help him prolong his life. That's why it was so brutal, that's why it did not succeed: Because it's actually not what Noxians believe in. It was solely to fuel the greed (as you said) of Darkwill, an old madman, not to help the nation to expand and allow other folk in it. That's also why, in the end, Darkwill got taken down.
And to also support my claim: You should educate yourself about Roshka Gloriana val-Lokan (OoC: Holy fuck I actually remember that name, I only left Alyssa out), her people, her brother and father and their interaction with Noxus.
Caitlyn hasn't ever struggled as far as I know ("Born to a wealthy and influential family of hextech artificers in Piltover, (...)") and Vi is a lucky exception (which occured just because of personal interaction with the higher class), that's not how the society works and the four families wouldn't even allow it to change, I'm sure people like lady Ferros would make (even personally) sure the system benefits them the way it does/exclusively.
Compare them to Darius and Draven, who both were born into the similar conditions as Vi but never created a relationship with anyone important - frankly because Noxians believe no single person is important ("I am no lord of yours." -Darius) - but pushed themselves to the top. Or Swain, who has been born into an aristocratic family (noxian aristocracy has formed under Darkwill as a toxic by-product) but struck to the rock bottom after his failures in Ionia and then reaching absolute top against all circumstances like public contempt - which in other societies would mean you are just doomed.