In short, this is a tradition and culture of the Chinese people that for them must really be believed and followed, or else you will be looked down upon no matter what you do in life. It's just like the topic you made for them if you want to win in the world of gambling those guides that they showed in the source you gave should be followed by gamblers who want to win and get lucky in gambling, that's all I see the objective of that article.
But in fairness, there are other people who are not Chinese but they follow this tradition thinking that it will bring them good luck in life and they did everything according to this Feng Shui.
People like to believe in things that give them luck. Who hasn't used a token in any form with the hope that it brings luck. Like bringing a small in your pocket to a big exam. As a kid I got some small crystal from my aunt from Africa, she told me that it has a lot of positive energy and I kept it with my pens through high school and university. Only the believe in it actually working helped me calm my nerves before important exams. The same thing is with Feng Shui, as long people believe in it it's helpful. A question I would have here is, if casinos build their casinos with a Feng Shui approach, are they doing so for the gambler or themselves? The gambler might look at it as better luck for his chance of winning. But isn't it also better luck for the casino owners to make more money? Or are these two cancelling each other out and in the end nobody has a benefit.
I guess it's just really a matter of preference and a matter of belief. If you believe something might bring you luck and good provision then do it. As long as you won't harm anyone in the process of giving good luck to yourself, I don't see any problem. Each people have their own fair shares of beliefs, traditions, customs, and habits. Some were formed and introduced at an early age. If a person believes in feng shui, we don't have the right to question why they do because it's none of our business in the first place.
It's just that every people have their own strong suit. If they prefer to believe in one thing to gain confidence in doing anything such as gambling, then let's let them do it for themselves. After all, not everything is calculated. Sometimes, some things happen because of luck as well.
I've never taken this seriously, as well as horoscopes, for example. Still, if it helps someone to win, then ok 
