I agree that nowadays it's much more difficult to find really prospective ICO amoung the ton of low-quality projects and scams. But even if you find such project it doesn't mean that you'll get x2 and higher just after the listing on exchanges. I know that most of investors tries to sell there token asap, and only experienced can distinguish the potential of long term investment. But if you check the most successful ICOs, you'll see that most of them gave huge income for those who HODL.