The reason for 9K pins is simple
You have people that seem to think X Pin is worth X amount and are willing to pay .
You have Stern ,JJP ect that want max profit and make pins . They are also smart enough to realize that we are in a huge bubble at the moment , and quite happy to keep pushing the prices up ( its good business )
When the bubble pops is anyones guess but until it does Stern JJP ect will be there to feed the frenzy .