I don't see how calling something the "x-factor" contributes anything, you might just as well call it foobar or mugglewump, or luck. Unless, as greenguy says, it's for self-glorifying purposes. i.e., there's no point in learning, doing research, applying self-discipline etc, because if you don't have the x-factor, then you're wasting your time. Not a very positive message is it? Then again, I don't suppose she wanted to give much away in a newspaper article.

If knowing when to stop is the x-factor and you have this knowledge then presumably it's because you've done the research which has given you that information.

I think the best way to beat the game is a very good bet selection for ec (not betting every spin),
combined with a soft progression and not be greedy.

I don't have X(no) factor, I do have Y(Yeah)factor.