Dear friend, not all advice needs a reason. And if you think this is not reasonable, then look for the problem in yourself. Gambling is a case where you don’t need a lot of words, because you won’t earn money by playing gambling. It is impossible to gamble for a long time and be in the positive balance, this is how the gambling business works, this is science, the theory of probability. If a gambling person starts playing, he will play for a long time, and in the end he will be in the negative balance.
Let's say no to gambling!
We cannot say no to gambling all because some people are there who couldn't control the way they are gambling because they can't manage themselves not to talk of gambling responsibly, in such case, this has to be an individual issue and not to be a general one, gambling is a means of offering to us fun and nothing more, but when we are getting other things aside being entertained, then that has to do along way from how we are gambling, while there are many others making fun and gambling responsibly even when we are not.
Yes, if we manage to win that's a bonus, but most of the time when a person starts to get into it and wanted to keep winning, then it will increase the desire inside him to play for more, there are individual reason like what you mentioned, some may aim for fun while some are aiming for money, being responsible is an individual task if you don't want to take that risk in losing more money better to keep gambling as way of entertainment and never to exceed from that.