Maybe investment no longer allows us to make quick profits, but I think that even if we don't invest, we can get relatively stable income from the rewards, but we need to work harder!
although the investment does not produce quickly but when it's time we can get a lot of money and even exceed the reward. if we have made an investment it would be good to hold it back and do other things like joining ico to get a reward so we can still get money when the coin price drops.