Re: If you're thinking buying mining hardware, read this first
I work a desk job. If I bought the best video card that fit in the thing (it's a decent system, I design tools with Autocad Inventor 3D modeling software) then mined all night while I wasn't there, no power costs. THEN, surely it is very profitable... 
Yeeaaa... you probably thought about getting some Nvidia Quadro or Tesla, eh?
Over 9000 GHash/s with one of those cards, fine quality - really nice.