Because it would be really annoying if winning crucible teams can earn unlimited marks but pve players can't.
I'm a solo player so winning zone control isn't very likely.
Combine that with the bullshit in the video and I'm very frustrated.
Edit: 3 per week like heroic strikes. Good job then bungie I approve though I would still like to know if the glitch I encountered is common
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Zone control gives 10 legendary marks 3 times a week if u win that many times.