As of now,I can't consider earning a living with bitcoin as I have my main source of incomeand also I have only minimal amount of bitcoin. But, when my purse grow,i will try trading in big volume and possibly earn a living from it.
Actually you can earn a living with bitcoins by just not trading or investing, but actually if you have some basic skills, then you can very easily make a living earning bitcoins. Like if you have coding skills you will find many projects here which needs coding, if you are a add developer then surely a huge demand of that too.