This system is way better than before. Before there was that cap, so you need to wait for the next week to grind about those coins again. This time you dont have cap, and you can earn how much you want. Maybe you have a ton of quests or something, and you do them all in the same day + heroic strikes + daily, you earn alot of marks. Ofc you earn less in some days if you dont have quests ect.