Don't go blaming the manufacturer too soon.
Japan has controlled pricing and similar boxed items will sell for a similar price, don't believe me verify an item's price with Sites like Rainbow 10 and Hobby Link Japan.
HLJ lists the following items on their website:
Hasegawa1/72 CF-188A Hornet "75th Anniversary Markings" --> Yen 1,400
Hasegawa1/72 F/A-18C Hornet Chippy-Ho 2001 --> Yen 1,600
Hasegawa1/72 F/A-18A Hornet "Adversary" --> Yen 1,600
Hasegawa1/72 F/A-18C Hornet Stars & Stripes --> Yen 1,600
Hasegawa1/72 F/A-18A Hornet "Blue Angels" --> Yen 1,000
Hasegawa1/72 F/A-18C Hornet --> Yen 1,000
Hasegawa1/72 F/A-18D Hornet USMC --> Yen 1,000
Hasegawa1/72 USN TF-18A Hornet --> Yen 1,000
Hasegawa1/72 F/A-18F Super Hornet --> Yen 1,800
Hasegawa1/72 F/A-18B Hornet "NASA" --> Yen 1,500
Hasegawa1/72 F/A-18B Hornet "Top Gun" --> Yen 1,500
Hasegawa1/72 USMC F/A-18A Hornet --> Yen 1,000
Hasegawa1/72 USN Blue Angels F/A-18A Hornet --> Yen 1,000
Hasegawa1/72 F/A-18C Hornet "1996 Dragon 300" --> Yen 1,500
Hasegawa1/72 F/A-18C Hornet "VFA-27 Maces" --> Yen 1,200
Hasegawa1/72 F/A-18 Hornet "World Hornet" --> Yen 1,200
Hasegawa1/72 USN F/A-18C Hornet "Wings 97 Atsugi" --> Yen 1,200
Hasegawa1/72 F/A-18D Hornet "VMFA(AW)-225 Vikings" --> Yen 1,500
Hasegawa1/72 F/A-18C Hornet "Golden Dragons 1998" --> Yen 1,500
Hasegawa1/72 F/A-18C Hornet w/Guided Missile --> Yen 1,800
Hasegawa1/72 F/A-18C Hornet "Chippy-Ho! Atsugi 25th Annive... --> Yen 1,500
Hasegawa1/72 F/A-18C Hornet "Atsugi CAG Combo" --> Yen 2,000
Hasegawa1/72 USN F/A-18C Hornet --> Yen 1,200
Hasegawa1/72 USMC F/A-18D Hornet --> Yen 1,200
Hasegawa1/72 F/A-18 Hornet w/Painted Canopy --> Yen 900
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The yen prices are also printed on the boxes, normally after the Item number.
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Those Kits CANNOT be sold in japan above those prices, discounts from 5~20% are quiet common though, and the shops still make a nice profit on them. Sorry, can't reveal what the actual wholesale price/percentage is on Kits.
Now to me atleast all the items are similarly priced, nothing to justify the said price ranges quoted by the thread starter.
So WHO is too blame for those price fluctuations, the SHOPS overseas, go to your dealer and confront him with the japanese prices and ask him why the difference. Than get ready for some good explanations.
Hasegawa or any other maker is NOT responsible for what their Kits sell overseas, they sell at wholesale prices and once the kit is shipped they are out of it.
Most of the price increases don't come from the maker, but from shipping and wholesalers and retailers.