If that's work for you, then just continue. But still I don't want to rely on purely luck when it comes on trading.
I think he is better to stop it, why should continue it? It is a bad idea to trade with no analysis and use a random way.
I guess he may be just lucky that time, it probably can't work anymore if he apply the same way for a long time.
Maybe you have a good winning percentage for now but time will come when relying on luck might instead give you a sudden loss and continuous losing streak. Maybe just try to make it balance, still relying on your luck while at the same time, still applying your trading analysis.
It is very possible to happen. Relying on the luck won't work a long time, it is the wrong way in trading. It will be worse if he use a big money, he is very possible to experience severe losses in the future by using the random way.
I don't consider your experiment as a success. From what I read, you only based on 3 days period. Tried to make it monthly.
His experiment can be called a success if he could earn profits at that time. But it is not recommended to use the same way in the future because it is not a proven way. IMO, it is not a type of experiment, it is just trying his luck.