Named Armor...
Well Nika’s set is a level 80 exotic set and the Duelist is a 78 exotic. Most people with the 78 set are going to want to get an 80 armor piece to skin it onto. If you crafted a set of 80 exotics it’s going to cost you several gold anyway, so buying Nika’s set saves you time and money in the long run.
Actually, to me it’s not the cost. To me it’s the fact I can’t look like prince rurik = (