Most importantly, we're a country and city that likes immigration of smart people who want to earn high salaries, and pay our slightly-higher-than-America taxes.
Here is one important question though: is it a city that you would recommend for young people (in their twenties)? Or is it nicer once you have a family and are looking to settle down etc.? And besides Amazon, is there any demand for tech workers over there?
Biggest problem you'll face is that we mix-use metric and imperial units, i.e. pounds for weight, feet for height, celsius for temperature, meter for distance.
Renting an apartment will cost you at least twice as much in San Francisco though - so most people are still financially better off with the smaller salary in Vancouver. There are non-financial reasons to move to the Bay Area (more interesting work being the big one), but don't expect your salary to go farther