[arin-ppml] Why are ISPs allowed?

[Artur (eBoundHost)]

My apologies if I'm asking a question that has been answered a million 
times, I have not been able to find an answer.

Is there a reason why ISP's such as Comcast/ATT, allowed to hand out 
unique IP addresses, even not static ones, to end users? Why are they 
not required to use NAT?

If ISPs were to switch to local address space, how many IP blocks would 
be released back into the wild?

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Best Regards,


Artur
eBoundHost
http://www.eboundhost.com