unprofitable i mean not even with electricy cost... but more
when your investment is 5000$
and you are getting 5$ per month after costs
you will need 10 years of mining

ok your saturn will make roi in next 20 years if you order today.
is it profitable for you ?
babysiting miner, hear loud and changing fans/paste for next 1000 weeks ?
If that's the case, people would not even bother to run their miner. But that time is very far off. We're not there yet.
Could be in 2 years time. Also depends on the price of bitcoins.
But we're talking about KNC here. They would have profited long before the cost of electricity is just a little under the cost of bitcoins mined.
Do some calculations and you'll see. But then again, not everyone has the brains or guts. People could always not buy or refund if they are too worried about not making ROI.