Yes bitcoin has become great source of income nowadays and people are making good amount of money from it even by working part time so if they gets full time into it then it will surely maximize their earnings and they may have higher income in compare to their full time job.
Yes bitcoin is now a great source of income. I'm earning a good amount of bitcoin, even though it is not a huge earnings but it is a big help for my every day need, from joining signature campaign and trading. If you will learn the basic of trading, you can also earn more bitcoin. Of course you need more patience if you are going to trade.