It depends on what you are looking at for $6000. It seems to me that Top Quality Kirby stuff is in the tens of thousands of dollar range. Where are low quality, late Kirby is probably overpriced. But, there is some very good mid-tier stuff, like his 70's stint on Cap, his 4th world stuff for DC, some of which goes into the top tier, and I think some of his eternals stuff back at Marvel. I think 2001 pages can be great, as can Machine Man pages. Not sure about Devil Dinosaur, or the like. It all depends.