I'll offer that many of those with a high IQ are not all that interested in becoming "highly successful" or obtaining "professional or graduate degrees". Those

I'll offer that many of those with a high IQ are not all that interested in becoming "highly successful" or obtaining "professional or graduate degrees". Those are really only importance to those who are inclined to hold value in those and they're not necessarily something everyone with a high IQ values. So, the results they're measuring don't account for what the subject group (high IQs) deems important to them. For example, if your family is struggling to make ends meet one might work hard to solve that problem by doing what's necessary, including digging ditches if that's all they can find to make ends meet. If you follow them you might find they come up with a way to make digging ditches much easier, faster, and better. And you'll most likely find that they didn't get any credit at all for that, and that they didn't care.