You still managed to cover 70% of that, so it should not be impossible for you to fill that 30% as well, you should be able to do that. I am not saying that you will be able to, all I am saying is that it is not that impossible since you have already done so much. I have never really cared about these VIP levels myself, they do not look like they worth it for someone as poor as me since I would have to spend way more than what I am comfortable with and then the return would not be great for a poor person who have lost so much to get there.
However, if you have managed to do it so far, then I would advise you to keep it going unless it hurts your finances. Obviously if it is hurting your finances somehow then you should not be doing anything at all, that would be quite a tough situation to live and I would not advice you to keep on risking it.
I know it might be a bit more rare, usually it is however we could consider; maybe he is a gambler who just got lucky once, made a lot of money and gambled that away to reach to that 70% and now he has none. Think of a person who got in with 100 bucks, thats it and then gambled and got super lucky and had 10k for a while, then gambled that away. All of that would allow him to reach from zero to 70% without a problem because he got lucky for a while and had a lot more. Now that he has none of that left, making that 30% could be incredibly hard.
Obviously this is just a guess and I am not sure if it would be still like this in the long run neither, maybe dude is just richer than you and me and he could make that back a lot quicker than we imagine. Or maybe he has been gambling with small amounts since stake started and he could still do it with small amounts in a year or two? I do not know, only he can tell us.