In essence, rich and poor have their own risks, just like you experienced about $100 being a lot of money. Thus, even if you have a background of being rich or poor, but when you spend that much money to bet and say it is big money,then it is also a big risk for you regardless of being poor or rich. Therefore, I do not agree if it is assumed that rich gamblers take a bigger risk because for me, it depends on the ability of each gambler as well as how much they can do to bet,then it will also be a risk for them.
comparing which one takes a greater risk between these two statements does seem difficult because it may be more directed at each individual. when rich people who have a lot of money can be said to be free to bet but if they have a good perception and a good mindset in gambling then maybe they will not take big risks, and for the poor with limited financial circumstances if their mindset is not good with such as fully expecting gambling they can take bigger risks and vice versa. I agree with you, indeed this is a fairly wrong view because what makes more sense is that it depends on each person's abilities and also their mindset because everyone certainly has a different mindset even though there may be similarities about the mindset in gambling such as expecting victory, anyone who gambles can have the hope of wanting to win.