If you want crucible gear play the crucible. Farming for mats just to turn them in for crucible marks and rep is like endlessly shooting into a cave just to get engrams. That's obviously not what Bungie intended. Why would you want to wear something you didn't properly earn anyways? Not all aspects of a game are meant for every single person to achieve. Some people are better at PvE and others are better at PvP that's just the way it is.