They never say explicit that these are just the US statistics, Bing does only grow there. Here in Germany has Google over 90% and nothing changed so far, also do they never say where these numbers come from.
Why is Bing still not profitable and Google earns more and more money?
This smells a lot like Microsoft PR.
I'm not defending the claimed numbers here, but it's easily possible that Google would be profitable at Bing traffic levels. Google is the largest and most profitable internet advertising company, so they could have larger margins per-click simply because of their position in the industry. Even excluding that, Bing could be purposefully doing things knowing that they will lose money (Live CashBack immediately comes to mind) in an attempt to increase market share, so simply being less profitable doesn't really mean that they couldn't be profitable..
Why is Bing still not profitable and Google earns more and more money? This smells a lot like Microsoft PR.