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I am. Did you see the mining difficulty increase I'm factoring in? With no difficulty rise, numbers would be through the roof.

The calculator simply looks at the past, difficulty is exponentially increasing the calculator has never been accurate for long term. I have many many friends that made this exact mistake and lost much more than they ever made.

It might of course not be 100% accurate, but how can it be looking into the future?
Supposing some kind of exponential increase with the profit curve flattening out after a certain time is as good of a prediction as one can make.
I will break even fast, so I 'm not concerned about loosing "much" more than ever made...