The answer to that is easy - most do not have a clue what they are doing!
The majority waste endless hours and endless money - I know as I was also once a fool ! - in search of certainty in an uncertain endeavor!
If you are in..and you are up..and it stalls..then why should you stay in..as it has stopped moving the way you want it to move!
How much does a measly commission cost compared to what you can lose on a trade!
It makes one laugh when you hear people talk about saving a few $ on commissions, and then they sit back and watch their p&l go into the red to the tune of $50..then 100..then 150...then 200...and then they panic and get out!
What happens next !!!!!
If someone wants to make money trading, then the first thing they have to do is know what their max risk per trade is, and stick to it (can be less..but never more) no matter what - NO MATTER WHAT!
If this is not possible, then best to quit and give the money to your kids, charity, or just blow it on booze and women if you are single, for at least you can say you had a good time
J_S