Apr 24 01:11 2014, Michiel van der Vlist wrote to BjЎrn Felten:
MvdV> Right now the market value for an IPv4 address is around EUR 10. My MvdV> prediction is that it may rise a bit in the coming years, but that MvdV> it will drop when the IPv6 train gains speed and that five years MvdV> from now, it will have dropped below EUR 1.
It's amazing. Just a few years ago RIPE would have BBQed you if you tried to sell IP addresses.