While from a customer standpoint, I like the idea of tradeups, but from a company standpoint, I see the discount on a pair of, say, original M50tis to be too large to be sustainable. I mean, to sell those, you'd have to cut the price to something like $2 or 300, which means to the customer, it would have to be may be 100, 150, plus there's the work and cost of refurbing them.
I am the Doctor, and THIS... is my SPOON!