I can say, in all honesty, that I would never want to live in one of these.
But I know there are some fans of furry aliens, and more general fans of nature, who would. There must be, because the company that makes them is still doing business.
Free Spirit Spheres,
www.freespiritspheres.com, constructs the 11-ft. wide balls using boat-building techniques, so they are completely waterproof, and they claim a single sphere can sleep a family of four. Somehow they also manage to fit a sink, microwave, and refrigerator inside. No word on how these items receive power. A second sphere that would hold a washroom and shower is... still in design. Despite this, the website claims they will provide you with a complete, hand crafted house for just £74,000. Self-assembly required.