IKEA would blow Tokstok and the like out of the water in both quality and price.

Besides crazy import laws, what I see as the major blocker there is that Brazilians are not very fond of self-service stores and of having to carry their purchased stuff home and assemble it themselves.

Of course IKEA could try what they do in places like China, where they partner with a local company for delivery/assemble. But then maybe the price for that service would be a factor.