Listen to the linked mp3 piece about Craiglist's "demonetization" of the newspaper business.
People are still mystified this ... witness questions like "the money disappeared ... where did that value go?". Come on! "Money" doe NOT equal "Value"! That's the core of TCP/IP vs. the Dollar, money and the net are rival stores of / circulation media for value.
Bonus : A comment I wrote about "Free" over on Blahsploitation.