I ever heard that people choose to quit their job for doing some crypto job. Whether it is trading, mining, or bounty. But I think that's the worst idea. Maybe they think that kind job like that can earn many profit but they doesn't looking at the risk and keep do it. Look at the market, they stay red and it will hard to get profit from investing or trading. GPU price is more expensive as well as a lot of capital to be spent when starting mining. Also Bounty Hunter has bad condition right now with too many SCAM ICO which caused some of them just wasted their time and doesn't earn anything.
How they can earn money for daily need if only depends on the crypto?
Of course, this is a bad idea, if you have not earned anything yet and you do not have financial independence and cash reserves to quit your job and spend all your time studying the crypto currency. But if you have certain knowledge, skills, and you already know which projects you need to invest and choose the right bounty campaign, then this is not such a bad idea.