why are the wealthy people so stingy?

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I have seen many wealthy peole who are so stingy.They bargain even for one euro although I know how much money they have. There were times when I had little money and I was obliged to be careful with spending it. There were times when I had to save money in order to reach a target. However in times when I had money I spent it according to my needs very easily. Even when I did not have enough I did not care for spending a small amount of money. I haveseen many rich people who get panic when they are obliged to spend money.They never give to people ,they behave as if they did not have a euro. I really can not understand this behaviour.The more money I have the more I spend. What is the use of having thousands of dollars and be so stingy?I will never understand this attitude.