Ofc they do else a T0 and a t7 would cost the same. I'm also taking into consideration that TT is returned but the MU is huge on items like this so a 18.5k t3 is not cheap when a T7 sold for 24k.
Market says otherwise.. I never said you get all your Costs back but if an item is worth tiering you get a lot of them back. For i2870 that is proven by a 24k t7 just selling when a +18.5k t3 was on the market. Would be stupid to pay 5500ped if the tiers was not worth anything.