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
I thought you were going to say that Traders do have aot of money for them to buy Altcoins that they are going to use in Trading, then they are going to make profits out of it by holding in the long run, and selling it when the right time comes. Bitcoin is a really great way where you could earn a lot of money by saving it and holding it.