The calculator is awesome. Nice find

I too received a never result.
But on the flip side its only 12 dollars away from being paid off in a 24 month period at a 1%/day difficulty rise.
My plan is to continually add to my pool until it can negate this investment.
The 20 odd that I wish to purchase will push my pool up to 16GH/s. The existing 8000 has almost paid itself off. It would have paid itself off much faster if I didn't have to pay for power.
You do raise a good point tho;
Everyone should do their research and review their motives before deciding to invest in mining equipment.