Since you have taken away our ability to trade-in Materials for Marks why not make it so we can trade-in our Commendations for the Marks associated with that type. Basically trade in one commendation and get 20 Marks or something like that. The fact is that I am not a fan of the Crucible, But I enjoy ranking up the factions. Unfortunately what this means that while I have about two dozen crucible commendations in my vault I never have any crucible marks, so they are essentially useless to me. It would make sense to allow us to trade in the commendations for marks that way the PvE players can acutally use the factions they have been leveling.