In my personal opinion I think that we don't need to focus on how much will lose and how much we own potential win. I always think that before doing gambling we should know our afford zone. And then we should make a strategy and set a limit then starting gambling. In this case I think we don't need to focus and your them lose and winning.
I highly agree with this. We must focus on the "how much I can afford to lose". This is much easier and less frustrating since we only gamble the amount that we can afford to lose. If we done that, there is no need for us to focus on how much we are losing because it can be considered as expenses for entertainment just like when we are watching movies and going out to a vacation.
Focusing on how much one will lose will kill the entertainment because the person will be worried that he will lose his balance and it kills the purpose of enjoying the gambling session. If we are worried about the losses then I think it is better to not gambling at all to save us from worries which can affect our health.