There's usually the big lull in April and May, a small sales bump in June, followed by another lull in July and August. I suspect this is because of things like the school year winding down and families preparing to do things like go on vacation or do other annual events. When I was guild and raid leader in some of the MMOGs I played, we would usually have much more difficulty fielding players in the summer time due to everybody having family or organized activities that supplanted their time to play games.
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