In real terms, I will pay an extra $10K to buy an new S vs a standard Box.
Say three years later, I go to buy a used Box. I will likely pay about $5 more for the S vs the standars Box.
So, the S has depreciated at a faster rate, ie, it has not maintained that edge of $10G but that edge has declined some 50% or $5G.
So, in relative terms, the S "incremental cost" has degraded faster than the base car's depreciation, which is less than 50%.
This is not surprising. The cost of options follows this path generally speaking. For example, you may pay $2G for the full leather interior or similar option. 3 yrs later, it is worth $425 as an add-on value in your car.
Now, as to WHY this is, well, I never try to figure this out. The market is the market!
Make sense?
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