4k he said for the whole set, that is why you have to divide it by 7 for the price of pieces.
Ursa set was sold for +5k, similar, but a bit better stats on that one, so 3-4k can be realistic for a whole set, than 1/7 for this part, if not this is the most common part ofc.
Edit: Well, this price is for the rarity ofc, if just by protection, i would say an adjusted nemesis is a better choice even for the same price.
Edit2: after checking in wiki, it has a really cool looking, so that would give + price in my eyes, so can be worth more if somebody is trying to complete a whole set.