That's the whole point of the event, they want you to grind for a 320 ghost drop in order to come back at us later and show how successful the event was because of how many hours players put into it.
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Unfortunately thats the reality of the situation. My friend needs a 320 ghost so im going to play crimson doubles. That does not mean i enjoy this event which brought literally nothing to the table in terms of content. But it seems like a success due to the amount of time i played it -_-.