Saying just gamble the amount that afford to lose will just end up in a more losses since people with that mindset don't care if they loss since they afford it. I hope I able to deliver what I'm trying to picture out here.
I think I got what you wanted to say but that isn't responsible gambling. I think what you are trying to say is to be more daring and take responsibility for it. You maybe have standards in doing your gambling activities but I don't think it will suit me. And I also think you misunderstand the meaning the suggestion to gamble what we can afford to lose. It simply means it won't affect you negatively if ever you lose that amount of money and has nothing to do with the losing mindset.