David Fermani said:If an interior isn't shiny when it's new, why would alter that look?
If the paint on the exterior doesn't have depth when new, do you try to alter that? Or if a car has 300 horsepower is that enough or do you go aftermarket to add more power?

Point is, most people (at least around here) prefer a lightly (as in low gloss) dressed interior, to them it looks better. Gives a lot of interiors a richer, more premium appearance if you use the right product.