I don't ride a brompton (look out for an upcoming post about the tribe that do), but I often wonder about adding one to my bike stable. Trusty is wonderful but takes up far too much room on trains and in cars. If I did ride a brompton I would definitely be going along to the brompton world championships.
There is something inherently comic about the thought of lots of (mostly) men in suits tying to race bikes with wheels the size of dinner plates. The relation of effort to output is pretty poor. Good on 'em for trying.