80% of the time bitcoin mining was at a loss.
Got some data or did you just pull that out of your ... whereever you pull out made up numbers?
Also I laugh at those that mine Namecoin at a loss compared to Bitcoin - something that was NOT here, when Bitcoin started. You can easily switch mining between these 2 "currencies" and currently it's just better/easier/more profitable to mine Bitcoin and buy Namecoins than mining Namecoins directly.