You make the rules yourself, so whatever decision you make is your right. It's kind of like a principle, you can break it or obey it. In gambling there are always things that sometimes don't go according to plan, things change suddenly so you might fail to comply with your own rules. But in my opinion that's not a bad thing, you could be deliberately breaking your personal rules for something bigger for you to achieve. However, be careful when your gambling intensity increases, this could be an early sign of addiction that you should be aware of from the start. It may be that now you can still control the amount of your losses below 30%, but when the intensity of playing increases and your thoughts are not controlled, it is possible that you could experience bigger losses, even up to the point where all your capital is used up.