First off, the Pantera market is small. There are too many cars for the demand.
It's difficult sometimes to know what eliminates a car from consideration. It could be the paint is too shiny or just the exterior color?
Every color has it's fans and enemies. For resale on a Pantera, mathematically I'd say red is the safest color, or easiest to sell.
I would have to agree that in this case it isn't necessarily that the car has a custom interior, i.e., varied from dealer delivered new, but I do think it is the yellow AND the way it was applied.
Even though that is probably as true of a statement that can be made here, I don't think that a completely stock US Pantera interior puts the car on the "must have list". In fact IMO it is a MAJOR detractor to the car.
It (the original interior) just says "cheap, what was this guy on drugs" to me. It's a far fetch to what anyone expects in a "true exotic".
The original vinyl is the worst stuff I have EVER seen anywhere.
So my point is, even a completely stock car is going to run into re-sale blues.
You just need one person who loves yellow. Those people are USUALLY easy to spot though?