1) Justify why we need a heavy bureaucracy such as ARIN for IPv6 numbering resources,
Because the members of ARIN (and the other four RIRs) want it that way. And because nobody has yet made a serious proposal to ICANN that would replace ARIN.
Using the organization to justify the need for the organization is circular reasoning.
2) Tell me why something like the old pre-depletion pre-ARIN model of InterNIC and just handing out prefixes with substantially less paper-pushing wouldn't result in a cheaper-to-run RIR.
Because the ARIN members, who pay most of ARIN's fees, are not complaining about the level of those fees. This means that they think the fees are cheap enough, or else they would demand that the fees be changed. All ARIN fees are set by the ARIN members.
Again, ... Anyways, the non-answers to these questions are very illuminating. ... JG -- Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net "We call it the 'one bite at the apple' rule. Give me one chance [and] then I won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN) With 24 million small businesses in the US alone, that's way too many apples.