yes in large number of people earning a living with bitcoin , they are earning bitcoin through trade , online tasks and signature campaign etc .
I see most people think that if bitcoins get more popular you can make a living with it, I do not completely agree with this. Yes the price will increase and you will benefit when more people join but it will be one time profit. Yes doing tasks surveys, etc can help you get bitcoins daily and hence you can survive.
It's in fact not as easy as it may look when people are talking about earning some coins lately. They think that they can keep getting the same amount of rewards from faucets, signature campaigns, and other things that allow you to earn some coins. So they calculate all current earnings against a price of at least $2000-$3000. They don't seem to realize that the higher the price will get, the lower the rewards will be.