Number of cashes
If I had put the same time into studying golf that I put into poker I would be shooting double boogy golf. In poker despite reading dozens of books, subscribing to TPE, having a MTT coach and analyzing my hands until I am blue in the face, I am still not a positive EV MTT player despite being at it 5 years since formally studying it. I have come to the conclusion that I just have worse luck than anyone else. My career proves that too as every recession I get laid off and every start up I have worked for has gone under. I am the guy who's car always gets dinged in the parking lot. So if one is inherently unlucky why bother. I could have paid for several very nice cruises of the money I invested in studying poker.