okay so if i think you're saying is the weekly matches? where you can get the marks more than once? if so, if its team based you need to be on the winning team, if its free for all, you have to be at least top 3. if its just the daily, participating in it should award you said marks. now if you guys are new to the game, the story shells out a good bunch of marks by just running through all the story, including the taken wars line, you should be able to earn 30 per character from heroic strikes but it seems you're abit far from that, the daily story should also award 10 but the best way i know is playing strikes, 1) you get loot, 2) any legendary that isnt what you want/need, dismantling them gives you 3 marks :)