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Turning 1,000 USD into 100,000 USD is quite impossible. If you manage your profits till you gained 100K grands then how come you lose after all? I think it is because of greediness. If I were you, I will secure 90% of my gains and turn into a real investment. Because risking your money in gambling is just burning dollars on your hand.
He already said that he managed to turn $4000 into $90,000 but due to very high ambitions to earn $1000,000 he lost the entire amount and was very sad because greed and ambition had led him to great losses.
In gambling nothing is impossible if it is supported by luck, maybe he has used his luck on the first and second, third and fourth wins so that after that his ambition must completely disappear.