The advantage is, having experience can prepare yourself on what to expect if you gamble again. It's not often favor to us hence we must keep in mind that in gambling we can really lose our money, but despite that we still keep coming back to try our luck.
Being aware of this it's not going to be hard to control our emotions if we have discipline. As long as we're playing in moderation and able to stop when already needed, then you can prevent becoming an addicted gambler since you know your limit and not greedy to win. Past experiences can help to accept the situation if we happen to lose again.
That is a given thing with gambling. We have to accept that as a reality that we'll lose money eventually.
But if you're up for it and taking time in learning how to win them back, it'll also have to cost something for it.
And that's what we need to do, play and gamble in moderation and so our budgets wouldn't be cut for something else and an important matter that we have to address instead of gambling.
Yes, that is a mentality that must be possessed by a gambler, as you said that from the start we must be ready to lose and that is the reason why it is always recommended to only bet with an amount that you can afford to lose, there are many benefits of that mentality, first it can prevent us from excessive emotions that can lead us to various actions beyond control, second our mental and psychological will remain awake, actually everything is interrelated.
Another thing is really not easy to reach the recovery phase or return something that has been lost, remember that gambling is based on probability (possibility) meaning nothing is certain and there is no guarantee either, and that is the reason why a gambler must always apply limits, not only on the amount of money wagered but also on your expectations of winning, as you said, namely gambling reasonably.