Opportunities are so hard to come by nowadays. The competition is so high. Considering the fact that bitcoin investment is a long term plan, you can not just quit your job to join it as a full-time hustle. The statement is 100% accurate on increasing your capital of investment if you keep your job. Your job will give you a steady flow of money, from which you can always create a budget to save every month or invest that into bitcoin. Even if you take the approach with DCA, in the long run it will also give you a great profit. Why lose one in order to get the other when you can have the both and both will give you great feedback.