"For the first matter, this actual proposal. I tend to agree with model 2, except for the categories. If you are assigning points to various resources to get to a category, you might as well assign prices to that resource, and invoice those tariffs. I would expect the amount of IP’s to be in balance with the size of a member. "

I am very curious what you mean by this, do you mean that a large customer (based on higher numbers) should also pay lower rates? I hope not?

The price should be at least the same, preferably higher. If that bothers them, it's a nice incentive to migrate to IPv6 and dump the IPv4 on the market, which enables new organisations to start deploying as well.