The sweaty community / comp / tournaments would use them constantly
A huge chunk would play it just for fun with friends when they wanna screw around etc.
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Yes, an excellent way to train for the crucible. Hang out with friends and try diffrent load outs, do some gun damage tests. Rehearse your teams roles. There are a lot of good things about private matches. Who cares about the loot. You can get that in regular crucible or IB game modes.
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Exactly. Every Halo game has had a thriving custom game community despite there being no incentive. Incentives in those games being rank ( Halo 2/3 ) and credits ( Halo Reach)