I don't see anyone could exploit it. The exchange rate is to low. Old rate: 50 materials traded for 25 rep and 5 marks. New rate: 10 marks for 20 materials. So if you turned in a full cap of 200 vanguard marks (2 weeks worth, can only get 100 a week) trying to get crucible reputation you would get 400 materials. Every 50 materials turned in gives rep, and marks, and you know have 8 turn ins. That gives you 8x25=200 reputation, and 40 more marks. The 40 marks can be used to trade for 80 more materials, so one more turn in. So it would mean [b]two weeks worth of marks can be turned into 225 reputation.[/b] That is less than a tenth of a rank. How would that be an exploit?