You know what's interesting?
This is also good counterpoint to the "if we tax the rich, they'll leave!" argument because, when the supply leaves, the demand doesn't. Just like here, where Canadian (and central/south American, European, African, Asian, etc) products step up to fill the gap, if a rich person fucks off because we're asking them to pay their fair share, there's a really good chance that someone less greedy will step in to fill the gap because the demand is still there.
We spend far, far too much time lionizing the supply side of the economy, but it's the demand-side that really matters.