The trouble with this is that the cost of an individual to society may in fact exceed $250K easily, especially in a socialist country like Canada. Health care, retirement benefits, subsidization of all manners of things predicate on a lifetime of taxation - $250K would be a steal to buy into this. Otherwise you're essentially selling the cheapest retirement plan in the world.
Not to mention $250K is not a substantial amount of capital to bring into an economy. Canada has an investment-track immigration program, the sticker price is well north of $250K at this point and come with requirements for employing Canadians (citizens or PRs) as well as minimum funding and duration.