...and eBay sold trinket-junk at first. I wasn't at demo-day but it's easy to see a path of iterations that goes from mechanics repairing cars today, to plumbing, to other trades to people designing and building real-world houses from their computers tomorrow.

I'm not saying this is where it is going, and as an investor you can not value a business based on these far-out ideas. But as a hacker/entrepreneur I imagine the founders are having dreams every bit as lofty as the one I just presented.