I know a number of guys who ride fixie in Calgary, and even year-round. Some ride up the hills everyday (including this 50ish year-old guy who I ride with occasionally) who lives out in Springbank Hill or they play bike polo on them, etc. These guys are nuts. It's a daily reminder that my legs are weak and my cardio sucks
The majority that I know have either been commuting for decades, or they used to race, etc.
I haven't encountered the urban hipster types on them but the commuters I know that ride them do it for the exercise, and because the bike is lighter, less moving parts to break down, and it makes it look like much less of a theft target to the average Joe - esp in downtown.
Nice bike by the way!