Michael O'Hare (Berkeley Prof) has an article about why public transit really wants to be subsidized:<p><a href="http://www.samefacts.com/2007/05/energy-and-environment/more-on-transit-and-urban-planning/" rel="nofollow">http://www.samefacts.com/2007/05/energy-and-environment/more...</a><p>The short version is that the marginal cost for an additional rider is basically zero.