That's right. If all were losing all the time, and only this way gambling sites could be making profits, gambling would cease existing long time ago.
Man, you're wrong. Gambling it's not about "losing/winning" this is about thrilling and risk. Human need something to thrill about. This is from where gambling appeared.
So if gambling would not create such moments for us, only in that case it would disappear long time ago.
I would argue with that. What's thrilling about losing all the time? Game is thrilling when you don't know the outcome, when you can either lose or win, or get even, but you never know what's going to happen.
If you meant to say that winning money with gambling shouldn't be our main goal, and that the main goal should be having fun, then I agree with you, but, think of it, it's not much of a fun to be losing all the time.