I've been lucky enough not to have a bear in camp (so far as I know) since I started paddling Quetico in 2002.  However, I've seen bear on three separate occasions that were close enough to where I was camped that they could have easily made the trip ... 2002, solo bear on Kawnipi; 2004, sow and cub on Burntside; 2008, solo bear (2 separate sightings of "same" bear) on Suzanette.  While not sighting bear on other trips, I will generally find recent paw prints or scat on portage trails.  So, I'd have to classify your lack of bear sightings as being "unlucky."

Since I sometimes travel solo and I also backpack in the Rockies, I've been carrying bear spray for probably 15 years.  I've yet to upholster it, but I prefer a deterrent to an annoyance (sound device).  I've seen a number of films where bear spray actually dissuaded Brown bears (Grizzlies).  

I also keep a clean camp and I'm also a confirmed hanger (multiple pulley system).  I'm not even comfortable with chapstick or toothpaste in my tent.  

So ... I'm mostly with Snow-Dog on this one!

dd