User blog comment:TheBlueRogue/Destiny Update 12/01/14/@comment-108.84.145.62-20141206111423/@comment-25250760-20141206122226

I actually prefer being able to buy materials. I never sold materials for marks, because I always need them for upgrades. Marks, I rarely ever had anything to spend them on. With this change, I was albe to apply several upgrades on my second character that I was previously unable to apply because of lack of materials. I had 200 marks and nothing I needed from a vendor, so I went and blew all 200 on materials, getting 100 of all four materials. After that, it was easy to apply all the upgrades I had unlocked.