He was actually talking about the importance of investing to make money, but in emphasizing this, he talked about gambling houses and betting shops; only being found in Poor neighborhoods, while investment banks, equity firms, asset management firms are only found in rich neighborhoods.
I am not generalizing but the majority of poor people engage in gambling houses and betting shops in the hope of alleviating their present situation in the fastest possible way they are likely to get more bettors in the poor neighborhoods.
Many rich people are investment literate they know that money begets money which is why these investment companies are situated in their vicinity, these investment companies are likely to get more clients and investors in this area than in the poor neighborhoods.
And besides these investment companies' portfolios are expensive something that poor people cannot afford to avail of, poor people live on their daily wage income while rich people have a lot of money to spare for investment.