In my opinion you should put cross play because:
1 would give you the opportunity to play with friends who have a different platform, so a lot more people would download it.
2 many people would buy dlc because those of the PC cost less, so if those of the play have a friend who has the PC and want to play with him who has the dlc they should buy them, and therefore they would be more likely to buy them.
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No I'm not playing against PC players.