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If you really want people to trust your system, you'll have to prove that you are profitable after an arbitrary # of dice rolls, like ~10,000,000 rolls. Setting a profit goal is not a reliable metric at all.
Your first sentence is right: Over a longer period of time, no one can defeat the House Edge, not even statistically. If that were the case, Bustadice would be closed in no time, because as you say, Daniel also wants to earn money with the website and has nothing to give away.
There is absolutely no system that has to prove itself here, that must be clear. Should there be such a system, gambling itself would be broken, the inventor would have earned billions of dollars and would probably never sell such a system.
In every gambling system there is a catch that cuts out the player profit and hands it over to the administrator. It can be House Edge or any other effect. Thats why many ends up in loss when they do gambling.