Drying an emulsion has been very difficult and never successful at EK. IDK all of the reasons, but the one that comes to mind is fog. Drying an emulsion causes coalescence of the grains which leads to fogging. If you don't take care, you can denature the gelatin and prevent it from gelling properly.
I'm surprised at that claim. I missed it. I wonder if he can make his in different grades of contrast?
Considering the price I pay for silver nitrate and gelatin, I have found that my emulsion would run about $100 / Kg of emulsion to do about 90 8x10 prints. I didn't see his price there, but my cost seems to be pretty close to the price of other emulsions that are for sale.
BTW, I am not selling mine.