What if they decide to keep trading and losing money until they master a strategy that will benefit them in trading
If they decide something like that then still they won't be able to make profits as a trader because losing enough money will change their beliefs regarding trading and they'll somehow get a feeling that the market is always manipulative. I know some of them may become good traders but most of them will give up on trading.
No one can sustain seeing his money losing all the time even if it means he’ll end up with a working trading strategy in the end. No matter how rich you are, you won’t let your funds becoming screwed just to learn in trading, instead you will look for another profit opportunity where making money is more certain, compared to trading in the market which requires experience and skills first before you will see the real profits in trading, add to it is the unpredictable market wherein trader needs to be patient at all times to avoid instant losses.