Trading success requires: 1. Knowledge of "what usually works" 2. Discipline/courage to take proper risks 3. Discipline to exercise reasonable stops 4. Pay attention The worse you are about any/all of the above, the greater your probability of failure.
You also need to pocket and the spread and any commission the losing trader is paying. In the UK, the spread betting companies effectively do this. The few winners are hedged, the losers are just left to get on with it and are effectively paper trading with real money and a wide spread and delayed executions.
This is the only answer needed for the OP's question. It is true that most beginners enter the markets without an edge, without fully understanding their approach or even having a codified approach. Nevertheless, their losses have as much to do with their emotions as where they enter and exit.
No. Ridiculous. The same money management skills would be used and the individual would still lose. Unbelievable.
If I had my druthers I would run a brokerage and take the other side of all trades. I would kick winning traders out.