If you're living in Canada on a savings account that is in USD, then yes, you're ahead by 30%. Otherwise you're making cdn dollars and spending cdn dollars, so you don't see the 30% difference in cost of living.
And as far as I know the big companies like Google, Microsoft, Amazon, do pay more than market salary in Canada. Their Canadian offices are not nearly as large though, they don't influence the wages/benefits culture as much as they do in the States.