Everyone haa their choices but having an infinite amount of money makes you rich whether or not you invest. There's no point in making any investment to me because the main reason why we invest is to create more sources or channels of income so that we don't run out of money. If I had an infinite amount of money I would just spend on the things that I derive pleasure from and also donate to charity
A huge amount of money could open up completely different opportunities for you, you would definitely look for where to invest money, and this could possibly become your main activity. And if you love gambling so much, you could even build or just buy a casino and play there whenever you want, without the risk of losing a lot of money, because it would all come back to you. )