I was going by what I was told by a reputable disp in Denver. They claimed that they go through 30 lbs a month. Every time I talk to a disp they always brag how many patients they serve (200-500) 30 lbs is 480 oz, or 13680 grams. That's about an oz for each patient if you average about 400 patients. Now some of the Disp taking cash probably don't report it all and therefore may not admit how much they go through.
Still is all speculation on my part of course. I guess I could be way off.
pp69
I think you're likely pretty close in your guesstimates, if you're talking about a large sized dispensary serving 400 patients or more.