On average, people raised in poor environments who have higher IQ do better than people raised in poor environments with lower IQ. More likely to be more upwardly mobile, more likely to be more whatever.
And on average, people raised in good environments who have higher IQ do better than people raised in good environments who have lower IQ.
If you're a person of color, on average, you're going to do better if you have a higher IQ than if you have a lower IQ.
Same if you're a woman.
And 140 vs 130 is a bit unfair. You're talking about looking for meaningful differences between less than 2% of the population as compared to less than 0.1% of the population.
And just because there are diminishing returns with something like IQ, doesn't make it useless.