It's very unnecessary for people that gambles for fun to track their gambling progress, because of the way that gambling is structured. The house edge gives the casinos advantage over the gamblers, so gamblers loses more than they win on the long run. Keeping track of winnings will just remove the fun because nobody likes to be a loser. Perhaps those that gambles professionally might have a reason to track their wins to determine whether they're being profitable over a period of time. But generally I don't think that it's necessary for amateur and professional gamblers to monitor their wins because gambling shouldn't be seen as a business because you win or make profit by luck.