...according to this apparently not:  http://mining.thegenesisblock.com/

Select any manufacturer/product and a sensible start to your mining date (based on speculative vendor shipment dates) and it appears that nothing is going to turn you a profit (actually not tried them all but I have most). 

Does anybody consider this calculator to be accurate? If it is accurate then why are people falling over themselves to buy hardware that won't even allow them to break even?

Any insight appreciated.

Thanks