Valid point.  Your classic business immigrant family leads what the Chinese business immigrants refer to as a "one family, two systems" lifestyle wherein the dad is a high income earner based in and  a tax resident of China and therefore legally exempt from a requirement to pay tax in Canada and mom and kids are low income earners based in and tax residents of Canada.  Hence the odd juxtaposition of low income families living in expensive neighbourhoods.  A review of the immigration stats over the last several decades would lead one to conclude that there are between 50,000 and 100,000 families leading this type of bifurcated lifestyle.  Two macroeconomic phenomena contribute to the situation: the emergence of China as an economic superpower with a set of social and environmental issues that push immigrants out and a conspiracy where global central banks and national governments to engage in financial repression to keep interest rates near zero.