Why Do 12" Tonearms Cost So Much More Than 9"?


For example, the Tri-Planar 12" arm is $3600 more than the 9" version.  SME tonearms are similarly priced.  
Is it really that much more costly to develop the longer tonearms?  
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Lingo, Yes, it is wrong for a true audiophile to be happy, ever.  Now you've figured that out, you can become a member of the club.  We meet with Dr. Kevorkian once a month.
If you look at Ikeda tonearms the premium for a 12 inch tonearm is less than 10% of the price

IT-345CR1   
9 inch arm (chrome) $6,900
IT-407CR1 12 inch arm (chrome) $7,400

Ikeda long only +10%, True, not much more at all compared to others in the thread. If you think the 9" is worth 7K.

I love the look/design of the Ikeda arm, just have no way I can part with $7,500. I am thinking, wed is my 72nd birthday, in 3 years I will be 75, that would be quite a prize, let's see if I inherit some money I don't know about!

Even then, found money, $7,500?