I think gambling already created a stigma as a bad thing to do and it can make anyone broke. Gambling addiction will not do any good unless you will be a professional like those poker players who were earning nearly millions of dollars even if they didn't win the tournament. I will never recommend gambling to anyone because I know how it is to be a gambling addict. It will never be a good experience.
I think we can all just base it from experience, a lot of people see gambling in a bad way maybe because they have experienced something not good along the way, we cannot blame them for giving advise to other people base from what happened to them. It all depends upon the person if he/she is going to take the advise or not.