In any casino that I play, these NoLimit games are so hard to give you a good multiplier, and if they do, your losing streak afterwards is more than big. Did anyone else have the same experience or feel the same, or is it just me? I know a few people who hit great multipliers, but I wonder how much money they waste until they achieve that.

Of course, if anyone shares his big multiplier win, that does not mean that he or she always wins such big amounts. These big wins are once in a blue moon and mostly the gambler will face small wins or even losses too.
However as you told that after winning in gambling we may find continuous losses afterwards, that not always the case. Also, even if it is true for any gambler, one can quit gambling once they get some win and then come back again next day or after some break. We need to gamble with some strategy, otherwise our emotions will never let us stop or quit.