I haven't heard of someone who left their job because of bitcoin. But there are people who can focus on bitcoin and their jobs at the same time. I think if you want to focus try to manage your time and learn more about bitcoin.
I have a friend that build his own mining rigs and he left his job because of bitcoin he is earning more than his salary from his job because of the mining rigs that he built and he thinks that it is easier and more profitable if he will focus in mining and also trading at the same time and i think he is earning now in less than the usual hours of work.