Greg,
You are right when you say there are a lot of variables. So it will be next to impossible to give you an exact figure...but I can tell you how long my ink lasted for my EPSON400 with 250ml cartridges.
I managed to get about 11 months of "moderate" use out of my ink.
Throughout the 11 months I have done 7 tile murals measuring about 2' x 3' using 6" tiles....NOT including my mistakes. I have done 60 coffee mugs, 120 desk name plate size no smoking signs, 20 or so trivets and LOTS of misprints and wasted time, paper and ink during my learning curve.
All in all I was pleased with the amount of product I got out of the ink. The signs that I did paid for the ink. The murals are samples for my showroom, however had I sold them they would have paid for the ink many times over.
With all of THAT said, I believe you can figure your paper/ink costs to be about $1.10 per transfer, and that might be high. So THAT is the figure you should use to calculate your prices and profits.....
There are many more folk here with more experience than I, but that is my take on it.
I hope it helps. Good luck
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