IKEA has a bizarre complex business setup which ends up with IKEA being the world's largest (and nearly least generous) charity. (http://www.economist.com/node/6919139/print?story_id=6919139)
Some people may not want to buy from a company engaged in such vigorous tax avoidance.
Sure, Ikea isn't doing it out of sheer altruism. They're doing it because, under the laws they're subject to, it's a sensible business strategy.