Just from personal experience Hrothgar are very rare. They only seem somewhat popular in packed cities because they stick out among all the humans. Crunch the data over a month from all the dungeons/raids you've played daily and you'll notice how few Hrothgars you'll encounter. Mind you this is true of Roegadyn and Elezen as well; Hrothgar is somewhere near the least popular.

I also recall something about Yoshida telling the dev team to not bother making separate hair styles for Hrothgar; he made that decision for them himself. I'm guessing he made that decision based on how little time they had before the expansion. As we all know they were still having trouble with them in the japan fanfest in March and their faces went through another change around May. They bit off more than they could chew trying to make an animal race.