Black Market for IP addresses?

According to the Internet Governance Project site, “The March 23 edition of the Dow Jones Daily Bankruptcy Report has reported that Nortel’s block of 666,624 IPv4’s was sold for $7.5 million – a price of $11.25 per IP address. The buyer of the addresses was Microsoft.”

I have been wondering if this was going to start happening. It definitely seems a logical response to the depletion problem. I don’t think the Regional Internet Registries have considered IP addresses as an asset to be bought, sold, or brokered.