See Tim Bray's essay, which should be titled "Are You a Sharecropper?" http://www.tbray.org/ongoing/When/200x/2003/07/12/WebsThePla...
tl;dr: "[Apple] owns the ground you’re building on, and if they decide they don’t like you, or they can do something better with the ground, you’re toast." In this case, if they decide the rent covers your garden plot as well as the fields, you ante up or die.