I think very few people give up a full time job to handle and survive from crypto transactions. To become a trader it is very important to have some money to survive for a period of time until you start making a profit. Trading is very complex and requires many years of experience to process all the information that will make you a good trader.
Giving up a full-time job for a job that has no assurance isn't practical but it works with a large risk in it. It's hard to support a day trader if there is no capital you can use when you lose a trade. I think it is better as a side job for a full-time workers or some people that don't want to sacrifice any responsibilities. I know some people who become a full-time trader and they know the risk of quitting their job. They gain months after and until now they still continue their daily trades. It's full of risk but the returns are quite amazing.
Its just really a matter of risk or some sort of gamble since we know that trading doesnt have any assurance on making profits on daily basis.So it all matters on how a certain trader would save up or allocate funding
on a specific situation that can sustain his self any further.I do even have some friends which are full time trader and still making their lives even more better and yes, amount of profits or money that can be made up cant really be seen if you do have just have a 8-5 work.I can say that it is somewhat mixed up with luck when you do jump into a certain career.