Ok not to turn this into the Great Canadian Debate here, but Alberta's GDP is dependent on the rest of Canada, and vis-versa. Alberta is not island, nor is Quebec or Ontario. Saying stuff like "Alberta subsidizes your tax tax bill" is not accurate.
It's similar to say a family where father is a doctor and makes $300k per year and the wife makes $50k, would Doctor ever say that he subsidizes his wife? No, because there are likely factors in how the wife contributes in other ways that allows him to invest and spend more effort in making income.