When I buy a nib pro its delivered for around 4700 and comes with expensive mods .Warranty is included and stern is available for support anyhow ,so I imagine they get them for 4 -4400 ? 6400 is pretty high markup imo and definitely heck of alot more than the 5 percent mentioned above, but if they sell than who are we to say anything and good for them and bad for the people who dont know any better lol.