Yes, Asians have a naturally lower BMI compared to Europeans and a BMI that would still be considered normal for Europeans may already be considered overweight for Asians. So a weight that would be considered dangerously low in the west may still be just a bit underweight in Japan.
On the other...
It's pretty simple. Who primarily plays the lottery? People who are bad at math and usually poor. Those people will not magically develop good spending habits over night after winning the lottery.