IIRC I think there was some doubt over the validity of Darvas's trading performance. IIRC there where even accusations of fraud which resulted in an official investigation. Its claimed that his total profits amounted to 216,000, not 2 Million.
Darvas claimed that he was unable to locate all of his account statements when the investigation was conducted, nor was he able to obtain copies of statements. The investigation couldn't find the money either, however Darvas claimed he had spent it !
Interestingly it was a bull market, and he was predominately buying..
as for luck, we'll leave that discussion until t2w is a beacon of shining light, or for another forum
I will say however that the people who claimed Darvas had made 2M where newspapers and magazines, and they did zero due diligence before publishing those articles (wot a surprise)