Using bitcoins as a sole and single source of funds as a full time job is difficult, I don't even know if traders can earn enough to only rely on bitcoins, the other problem is volatility which makes making stable profit from bitcoins a very difficult task. The only ones making full-time work on BTC are developers and employee of large bitcoin businesses, each of these have staffs even exceeding a small IT company.
According to my experience, traders do have enough money to deal with their life and raise their family. Trading should be considered as a decent job online and who want to make money as fast as possible, try to learn trading. I have seen many people which are rich thanks to trading
You can be a Bitcoin Trader as a main source of income alright, but the only problem is you got to start with a lot of capital meaning that you needs to have a big money in order to have money. Right now you can buy Bitcoin at 2468$ which is expensive well in order to have a decent amount (if you want to sell around 2700 which has 232$ in profit) you need to be buying 3 Bitcoin for you to at least have a decent profit which will equate to 696$ if Bitcoin can reach 2700$ in a short time frame.