I would disagree. You may validly choose a less efficient language for a valid reason. Or you may validly decide that you feel more comfortable with a language even though there are others that are slightly more efficient. But when a language takes significantly more developer time and effort than languages with a comparable application, I can't see why you would choose it without some really compelling overriding reason.
There have been many attempts to classify and compare languages empirically, and different measures have different levels of flaw and merit. Is there any empirical evidence that comparitively measuring programming languages is fundamentally flawed? I'm not saying there's not, in fact if anyone is aware of any I would be very interested in reading it.