I cant believe it. They shipped the chips first. We will never reach ROI now.
For batch-3 devices that are delivered soon, you're looking at a 3-4 month ROI. Not bad, but not great. Any significant delay will kill that ROI as lots of hashing power is coming online late this year.
Can you provide a spreadsheet of your calculations? I believe you are way off and not even in the same ballpark.
This is incorrect. A 4-module unit cost 100 btc and the exchange at the time was around $72. You entered $7200 cost for the 3-module machine.