Hello Bone,
Good question.
In my opinion the reasons are:
1. Traders and humans are not built for structured day to day working. Picking a stop loss and profit target is alot of work, compared to "ok, let me just get in and see what happens, hopefully I make some money"
2. Traders and humans do not like rules and regulations. Setting a stop loss and profit target is rules and regulations.
3. Traders do not trust their trading idea to take profit at X and exit at Y. When they enter the trade, they think "But I can make more money if put Y down some", "Is this stop right or wrong"
4. Traders want big money right now. "why should I risk 1% of my $10,000 account balance right now, man that is only $100, man that means I can only afford 2 shares of Apple, or I can not even trade the NQ full contract with this crappy $100, Fuck this 1% crap, I am betting $1000 on this trade so I can trade the full NQ contract, and Fuck going to MNQ for $2 a point, that is walmart money, I need to hit a big win to brag and show my friends and co workers what I did"
5. Traders do not understand performing trading in a consistency, structured manner, risk controlled manner every day for the next 2 years or XXX to X,XXX trades is their ONLY Edge. Even if the out come of the 2 years or XXX to X,XXXX trades is
-XX,XXX They think "I want to make money now just like at my job or like the youtube traders are doing"
6. Traders do not know how to select and stop loss and profit target consistently.
7. Traders do not trust their stop loss and profit target consistently.
8. Once the account goes to drawdown the trader says "I am down $3000 from $10,000, if I just trade 5 NQ on this one trade, atleast I can get back to breakeven, and do not have to fuck with this silly 1% position bullshit" ,......'Oh, and forget this profit target, lets move it up some"
9. Traders do not want to study wins and losses, to see if profit target and stop loss is correct.
ok that is enough. FYI, I am one of those trader.