Actual production cost of one single bicoin is aroundt $530-$550. Any price below $500 is a steal. Buy now or regret years later. With difficulty ever increasing miners are getting screwed now cause anyone mining now is running at a loss.
I think your logic is the wrong way round.
If something costs more to produce than its worth doesnt mean its a good idea to buy the product, just thats it a bad idea to produce it.
Bingo. All the perma bulls saying that mining cost will drive exchange rate upwards aren't really using sound logic. Surely, miners could simply be making a horrible investment (if currently mining at a loss).