That's basically because people consider trading as gambling

In other words, they are not really for money (or for the pleasure of making money) but rather for the pleasure of seeing how their orders get executed (when they do get executed). They expect to be earning profits but this aim in only tangential to the adrenaline rush, which is why they are trading. Otherwise, they wouldn't be overtrading but rather staying away from trading most of the time, for days or even weeks waiting in ambush when the price hits their targets while doing something else in the interim (let's call it active waiting)