Next Gen has come down plenty over the last couple of years as have the vast majority of pins.
Struggles to get 3.5k these days, a very ncie one sold a couple of weeks a go for 2.8k...why in the world would you buy a nib for that $$ when the prices are dropping?
pinball bragging rights seems so childish to me...lame...cure cancer or feed the world then you can brag all ya want.
I might be wrong, but I doubt the buyer of a NiB like this would be doing it for the bragging rights, rather there's enough cash available and no real needs, so oddities become interesting, and spending a lot on a very rare item the motivation.