I know someone that was unemployed, and the person works full here, each morning starts with trade, while waiting for the order, usually works in campaign. The monthly income is uncertain though.
He/she must be knowledgeable in trading, that is why he/she is earning good and at the same time he/she is at the signature campaign, for sure he is earning enough for himself but for how long will he/she do this? or will it last long? but it's good since he/she is unemployed... 
Not now but if i have so much Bitcoins then i will may quit my job. Because then i will make a good investment and earn a good profit through
Then we should invest in bitcoin so we could earn big and not just earn it to make our going full time in bitcoin faster...  

Never quit you job if you are not sure that you can earn consistently in this world. Crypto world is very dangerous and opportunities just come and go for the people here so if you want a consistent income then you go full time with your day job.
That's right, in our day job we still has a chance to transfer to other jobs when something went wrong in the company we are working at, while in crypto if we last here more than a year and not practicing our profession, then I think it's hard for us to reemploy...
Well there are some signatures paying well, and may be enought to live from it at some countries, where those person from?
Because to make a live from signature and trading is a high risk as well. If i had several coins i would just exchange them into fiat and apply a big part into savings, soo all months i would get a stable income.