I think the website traffic stats are quite representative for the top few series.

Particularly when MotoGP.com is way ahead of stuff like crash.net (which is ranked at 22,131, incidentally), for instance.

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In a completely not-blatant point, make sure you all have a look at the annoucement at the top of the page and vote to keep our forum as one of the ones which has a Pickems series for next year