Given that your mark intake is capped at 100 a week, this means that every week you could: - Run yourself ragged in the crucible in order to get vanguard marks equivalent to four strikes - Play twenty strikes in order to get crucible marks equivalent to seven matches or running round the Scablands eight times - spend an hour farming spinmetals to get the same results as spending fifteen minutes farming spirit blooms You can't even use it as an inefficient way of storing marks for later, as converting them back counts towards your weekly cap.