boatyardblues
Thank you for your question, I will try and be as brief as possible answering. There are many reasons but I will give you the most important.
My wife and I have spent our entire lives living here and lately caring for our elderly parents. My wife's mother past away last summer so we are now able to relocate without responsibility.
#1 Quality of life and lack of stimulation. Vancouver is not strategically located worldwide unless your doing business or have family located in Asia or the U.S. Three days is a perfect length of time to visit Vancouver unless you intend going skiing or on a boating holiday. (that is assuming you have moorage which is almost impossible to find.)
#2 Rising Crime.
British Columbia and greater Vancouver have the highest crime rates in Canada, we have shootings everyday and a body is found every third or fourth day in the suburbs. Toronto is three times our size but has half the reported crimes and not nearly as many violent crimes. Our law enforcement is hugely under funded and some communities are now gang controlled. We're in a very quiet suburb free of serious crime but I wouldn't think of going into Vancouver after dark especially after 8.
#3 Affordability or lack of;
Our governments at all levels are spending at record levels but have dwindling revenues so they are taxing anyone working or in business or those that own any assets, especially foreigners.
Many must work two or three jobs just to survive and sadly most of the income is going to multi level taxes. We pay 14%+ tax on everything we purchase, council/property taxes which are 40% higher than yours and I checked carefully. The taxes and user fees go on and on and this is destroying our middle class and paralyzing the lower class to the point of outright anger. This working of two or three part time jobs not only causes exhaustion but creates a very unhappy and stressed working poor population. What I found interesting reading was 9365 45-55 year old Vancouverites left in 2016 and that figure is apparently growing. Many would love to leave but only a few cities in Canada have good employment options. Most of our educated younger population must leave for employment and usual head abroad to U.K., Australia or New Zealand.
I could go on but I think you get my point. We have gone from a lovely town or city to a smaller version of Chicago. It reminds me of Kabul, your safer in the green zone but venture out and anything could happen.