They treat it as a serious business because they are trading with real money. Some of the best traders burn out periodically, and need to take a break. Successful traders tend to strive for balance. They do not trade all day every day, and then study charts after hours. And then take a few trades in the after-market, and talk trading all their waking hours, etc.
Most successful traders tend to have a balanced lifestyle with varied interests.
Good traders need to counter the stress of trading in healthy ways. Trading is a psychological adventure, manage your mind and emotions. Take vacations regularly, and get physical exercise, in order to fight stress and burnout. Following someone else's advice most often leads to failure. A newsletter subscription will not bring you easy riches.