It's entirely possible that you could treat it as a main job, but the OP would also see the risk and the amount of knowledge and skills that come with it. And the spirit is really strong, although it is possible to make a lot of money this way
Some people do trading full time, even you can't call it a job if you can earn from it I'll also spend my time trading where you can sit and rest while getting paid. It's up to every people if they do trading for part time or full time, as long as they earn money from it there's nothing wrong by trading than having a job. Base to my experience, in trading I can stay at home and spend time with my family while working at the market and my investment. But don't settle in bitcoin, it much better to make it as a part time because there's no insurance here unlike in the companies. Still, its up to you to decide where you are comfortable spend your time while earning.