It all comes back to financial management, the richer you are, the more complex your problems will be and you have to spend as wisely as possible.
Assuming you are a rich guy, small bets can make you satisfied if you only have one goal to satisfy your gambling desires. The problem is, what many rich people are after is not only that, but also personal popularity and other things.
What complex problem do you mean? Is it still related to money or business? But I heard some rich people don't have a problem about money anymore. They don't need to spend wisely and they can gamble whatever they want. It's important to reduce their stress that came from their other/non-financial problems. In gambling, there are two things that a gambler can possibly get. And that is profit and entertainment.
Those who bet small are probably playing for entertainment only while those who bet huge are likely playing for the profit. Gambling seems not a good way to get a fame because many people are against with it. Though maybe it's fine if this is your origin.
Everyone regardless of their level of wealth has money problems, the poor have the problem of having too little money, while the rich have the opposite problem and need to find a way to protect it and increase it.
And if anything money can become an aid that can make any addiction many times worse than what it could be, as someone that does not have a lot of money cannot keep their addiction going on for long, while a rich person could do so until they destroy themselves and everyone around them.
