At those early stage of Bitcoin investments, profit was more about investing earlier enough because earlier investors had the opportunity of buying Bitcoin at a much cheaper price even though they didn't use much amount to buy it. It was possible to buy up to 2 BTC within very few months even though you don't earn that much. You can afford to buy that much BTC because of how relatively low the value of BTC was and once you've done that and you've held your BTC till now or any where above those range of price, you're certain that you've gotten a good profit or at the least, you're comfortably sited at a good profit region. With little DCA or a good amount during bulk purchase, you can easily reach your goal in the past but that's no longer the case at the present that Bitcoin has gone this far and is somehow more stable than it use to be.