Have you purchased all available land? If not, why?

Not yet, but my current project is to buy up all the land on the border of what's available. That way my landing zone will stop moving around (until they add new land), and I can finally design something for it. Not much point as long as I know it's going to keep moving.

As a "bonus," that means it'll feel a lot easier when I buy up the unused land in-between later. :)