You have just answered the question yourself, someone who is rich will take much risk reason because he has enough already and if you check those rich people don't care whether they loss money or not, it doesn't really affect them that much and rich people don't play much game what they do is select 2 or 3 games that will give them 2-4 odds and heavy stake it and that is why they win more than poor people. Morever, if not for something poor people aren't suppose to be playing gamble because any money they loss will really affect them, imagine you have a wife and children and your responsibility is to take care of them and you are being paid 30k a month and you always use 500 naira to gamble almost everyday before one week you will be spending like 3-4k out of 30k that will really affect you and the family imagine now that every is very costly.