Half? The estimations of people who have completed crota this way is a little over 1%. So about 100,000 of 9.5 million (thats 100,000 people, not groups. So each group is 6 people). So a little more than 15,000 group kills.
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100,000 people paying $20 each is $2million dollars. That's probably a quarter of the staffs wages, don't see it happening!