i know a man that writing in all his gambling activities,from losses and winnings and he tells me that it made him sick sometimes checking how much he losses while the amount of winning is very little compared to others.
Absolutely, if someone has this real statistic of his own gambling activities then he will feel so bad to see the number of much money he had lost before.
Even if someone do gambling for fun only and lose small amount only every time he/she gamble but it can be a big amount if he/she count it in details.
This overall statistic may make us feel so bad and regret it, as we may think that "if I did not gamble, I'll still have xxxx money and I can use it for other better things"
I also do statistics on my past bets and gambles in order for me to become aware if I keep losing or winning in gambling. It is good to journal sometimes because it make us become a better gambler. We can also know our strength and weaknesses if we will keep recording our bets history. It is better to become aware than to just gambling without knowing our profitability.