This is a great analysis on how modern gambling/betting has evolved more into a "science" than an art, as it used to be in the past.
Today's professional gamblers process data all the time and try to minimize the impact of the role played by Lady Luck.
Another thing is that modern gamblers have realized that being in good form and health helps them a lot in staying disciplined and focused on their game and keeping cool, regardless of whether they win or lose. This a big difference to what most gamblers used to be like in the past, i.e. heavy smokers, drinkers, etc. like coming out of an old Western movie.