Had a slight concern like this going in, various competitions seemed to be ongoing. A mid-league off period isn't good, but then again, if it's just the same 4-5 competitors there won't be enough interest. Maybe it's worth experimenting with switching around the timing, perhaps a different day schedule would suit people better? Another consideration could be randomized rather than record-based match-ups, this seemed to be effective at least in the challenge league thing. About voting - I've always been a fan of an altruistic rather than punitive measures, perhaps the 2 mandatory for new sign-ins can be relaxed to encourage some sign-ins, but if users aren't participating because they don't enjoy voting then that's no good either.
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