I believe that crypto-currencies can be a full-time job. You can earn it, trade with them, you can invest in many services and you can have nice income from that.
I think many people are here for that purpose and they live from money they earn here.
I have steady job, for me crypto-currencies are hobby, more than that. I believe that investing time or money, or just one of this two things is investing in future.
This will be huge one day, and who doesn`t have crypto-currencies portfolio will have a hard time in future.