Here's a report on metcaffination. I've been doing this on school days for a little over a year and my experience with questions was largely similar.
As folding bicycles are rather rare, I am frequently asked about it. A friend of mine once observed that Americans, in particular, have a tendency to ask how much you paid for something: this is certainly true of the Brompton. Complete strangers are often most interested in how much it cost me and have no hesitation about asking.