When I started gambling a few years ago, I won a pretty big amount of money and that opened new doors for me to pursue new business ventures. Some of these ideas panned out and some flopped miserably, but I still managed to generate some money from the the ventures that were successful.
I now have something that can generate some "passive" income and something that needs a lot of my time and attention, but overall it improved my quality of living and it encouraged me to follow my dreams.
I still gamble, but not as much as I did before... because time management has become an issue. This will not secure my retirement, but it gives me some freedom to experiment with more ideas. (I still need to work between 8 to 10 hours per day.... and weekends, but I have something to fall back on, if something bad happens)
Hope your big wins, did not just go back into the casinos.
You managed to get a big win once and decided to invest this money in business, and you never thought about playing again to get another big win, or did you decide that it would not happen twice?
In fact, I have the same opinion, you need to withdraw the profit and do everything possible, so that the money continues to work for you. I have never had to get such a big win that it was enough to start some business, but I never really set such a goal for myself. I also have to work a lot, often more than 10 hours and there is too little time left for entertainment, and this is exactly how I feel about gambling.
Regarding big wins, I have always had the opinion that this is very similar to stories about how people win the lottery, and if a person does not know how to handle money (he is not ready for big money), then he will lose this money as quickly as he received it, and return to his usual state, when he was comfortable.