I'm just replying in support of bringing back the previous option and having both. There was no reason to remove it as you would still be on the losing end if you tried to exchange one mat or mark for another. I mean if you traded 50 mays in you get 5 marks and a small amount of rep/glimmer. So you would need to trade in 100 just to get the 10 marks to trade in for 20 of some other material. Seems fine to me.