The Great British Train Robbery

Here's a question for Tim Worstall and our pro-privatisation friends at Samizdata and The Adam Smith Institute.
Why should a privatised railway, which not only receives four times more taxpayers' money in subsidy than a nationalised railway did but charges much higher prices to the consumer, not be bought back into public ownership? Along with around 70% of the British public, I would like to know.
http://www.guardian.co.uk/transport/Story/0,,1959184,00.html


UPDATE: Tim Worstall has posted his response to my question here