National tat powder inks! Need advice

I was thinking about getting Nationals powder pigments, But I called with a question that they couldn't even answer about their own product. The question was, "How much ink does the 1/2 lb. bag of powder pigment make roughly?" The best answer I got was It depends on the color. Some are thick and some are soupy. They couldnt give me a round about number a half Lb. bag can produce! Does anyone have experience with using their powder pigments that can answer this question? Its a shame we on here can answer more questions then the sales reps can on their own product. Why do we not have them 6 figure jobs?