WoW was spending literally tens of millions of dollars on content seen by a fraction of a percent of its player base.  That was unjustifiably bad.  That it continued for quite some time was a problem of the dev team culture and also, probably, a symptom that they did not have good metrics.  (I have been there, done that, and got the T-shirt.  Not to the tune of tens of millions but I've certainly frittered away man months on things seen by less than .1% of customers and, even worse, 0% of trial users.)