if you want to earn a high income you have to be at high risk like the one in the bitcoin forum where people are very much to invest in it and it must be very big capital by buying a high 1BTC price or investment in ETH.
Any investments take risk and when you put all your money on it, you take big risk because you either earn good profit or lose when the price goes down more but you cannot hold any longer to wait for recovery. Invest on something that has potential for growing along the market.