A bit like asking why first class seats LAX-LHR cost $10,000, isn't it? The answer is because that is what people are willing to pay for them
BTW, I use
www.airplanesuperstore.com
They are mostly 1:400 and 1:200 die cast metal printed with ink running in the $24-$60 range.
I know Austxhiker has a plane from there as his
Flyertalk Survivor contest prize

...as does Shack over the matter of
last year's NCAA Division 1-A Football Championship
[This message has been edited by kokonutz (edited 10-16-2000).]