> but this is also probably a bulk sale so there might be a discount
I was thinking the opposite - isn't the block (or a sub-block) worth more in bulk than its constituent addresses?
In the same way that a complete collection of N Foobars has more value to a Foobar collector than N times the average value of a collectable Foobar.
I'm seeing numbers between $10-$20 per IP, but this is also probably a bulk sale so there might be a discount... Say +/- $250 million?
Perfect time to sell them off as the IPv4 shortage tightens and IPv6 hasn't reached critical mass yet.