4) Lastly, resale. Believe it or not, people will still buy unprofitable miners. You may well recoup $100 selling your unit when you are done with it. Not everyone can do math.
This is where you can actually profit. Not in the miner earnings, most calculators will give you 100 days+ or maybe never.
It's in the resale where you can be in the positive, if you sell it at the right time, for the right price. Ebay, Amazon, or right here in this forum is where your loss can end up a gain.