i have many friend , when i win i give some money to all my friend , and when i lose they send me simple......

yeah you can do that when you have a lot of friends. but there are times when you're going under and no friends who could help, of course you should have a backup plan. for example sell valuable goods or you have some money saved up it would have been better
There are two types of friends, true friends and fake friends. Let me describe them, true friends are there in times of happiness, hardships and needs. And for those fake friends they are also their only in time of your happiness. Let's be straight that no matter how many friends you are, for sure in times of your needs maybe they can help you but remember that there is a time that no one can help you when it comes to money, trust me. You need to have plan B for that, like using your savings.