If you can live on a dollar a day it's very possible to "earn a living" with bitcoins through the various service on this forum.
That's right, if the cost of living in where you live is just one dollar a day, then this forum would be a perfect source of income.. but I don't see any country that one dollar is enough..
Its hard to earn a living with Bitcoin. Because you can never know what will happen with the value of Bitcoin and that is a big problem.
Than your life will depend on a currency and that will be bad. One monent you are rich and one moment you are very poor.