Hi Frederic,
PI holders must maintain an up to date e-mail address with the RIPE NCC. If they do not, the PI space will be returned to the unused pool.
How do you know if it's up to date - or even listened to? Best way is a contract that says they pay a sum yearly. If the cheque doesn't arrive, or bounces, you take the space back. A small sum like €100/year would suffice.
i will give you 10000 bucks and during 100 years it will not what your problem, what the block became.
It still remains a problem. This proposal is not about the money. It is about responsible stewardship of internet resources. The way provider independent resources are handled now it is impossible to follow what is happening to those resources. Resources that are not in use anymore are lost because there is no way to check this, while other organisations might need those resources. Policy proposal 2007-01 was introduced to solve this problem. With a contract between an LIR (or RIPE NCC) and the end user, we can follow the resource. We could check if it is still in use, if the usage still complies with the policies, etc. - Sander