Considering bandai tends to spit on the dirty american market, the ability to find decent macross stuff that isnt low quality trash specifically designed for us is difficult at best. Add in the re-seller market being how it is in modern times, many specific types and franchises end up on scalpers markets or inflated far beyond what they deserve to be worth. Macross being one of these markets. A kairos, even being a limited run item of a limited run franchise, should not be sold for 4x its already high base price. Even more so when 8/10 times, these items are used, and damaged.
I would pay 300 for a Kairos, and a little less for a chronos. IMO, only way to deserve insanely inflated price points are to be new in box in absolutely mint condition. Not for used with broken parts and damaged boxes, and scratched like someone cleaned it with iron wool.