I've heard of the claim that Persian rugs (especially the pre-1950's, hand-woven kind) actually appreciate in value the more they are used.
We have seen that in the Middle East some new rugs are thrown into the streets for “aging,” where they are driven over by trucks and camels alike. They come through the ordeal looking much improved. Rugs are, as they say, forgiving.
Intuitively, I would think that the more people walk on a carpet, the more it becomes damaged, or at least would wear out over time, which would do just the opposite to its value. Indeed, this site estimates how much a rug is devalued based on wear.
Is this simply sales puffery, or is there validity to the claim that walking on rugs increases their value?