1 - sales. microsoft makes more on software and takes a loss on hardware AFAIK. so immediately, there's profit
2 - good will, and introducing the franchise to players that might have never played the series, and maybe would never try it otherwise
3 - hype people up for the new halo 6 or whatever and get sales from new fans that could translate into more people wanting the nextbox.
there's actually quite a lot of reasons as i went over in my previous post and it seems like it would be a good move imo.
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