You are very right. Not most but all hyip websites are scam. They are paying members from what they collect from other members. Which means they are paying members there own money back. And when they have accumulated enough money, they will stop paying and eventually close the websiteWanting to double your money fast may lead you to want to invest in Hyips or gamble, you should never trust those methods. You might end up loosing all your money. So it is just best to be patient and keep working hard. You can start a side business and do more online work in order to boost your earnings.