There is a EUR 2000 sign-up fee and then yearly dues of EUR 1300. Again, the system seems to favor companies with scale, rather than a start-up looking to connect a small number of houses.
I'm debating what to do on the addresses because the feeling is IPv4 addresses will all be gone shortly. It would probably be a wise decision to get some while they're still around.
On the other hand, EUR 3000 would buy a good amount of fiber or conduit. I'm going to hold off on the IP addresses as well until I figure out if I'm going to be running my own ISP or just providing dark fiber to others.