Bitcoin is a digital currency as a source of income.you can earn Bitcoin by trading or working for tasks to get Bitcoin as a payment.I don't think you need to left your job you can earn Bitcoin on your free time doing some tasks.I am also working here and others site on my free time to get some Bitcoin.you just need to connect with bitcointalk you will got more information how you can earn bitcoin.
thanks
You are right that bitcoin currency as a source of income some countries have unemployement rate is high and their peoples are earning income through bitcoin like the signature campaign, trading and gambling.thanks