I think it can be the both,some persons see it as a lifetime job,while some persons do not see it as such,but for those who see it as a lifetime job,they are the ones who go extra mile to knowing more things about trading.They lose more,get more experience and try new things about trading Because they believe they want to earn a living through it.While these other set of people who assume trading is not a lifetime job only feels it is right to trade at their convinient,and to trade when they have no pressure on them,and with a lesser amount.They believe trading is more risky that we can immagine.
Maybe there are those who trade as their main source of income. perhaps they even only earn income from trading. but maybe one of the family members has to help to meet the needs. meaning there are other people who also work in the family.
when a trader has to meet his needs every day, it means he is trading under pressure. and it requires extraordinary calm to make money every day. Maybe you don't have to trade every day, but you definitely have a target to achieve certain profits.