There were less than 8,000 F generation M6's produced for NA, across all body variants and years so rarity is a factor. Compare that with the E9x cars - 25k+ were produced for NA.
Another theory - could be to do with the F gen cars typically having a $60k+ MSRP than M3/M4s - making them less accessible to people who want to buy mod/discuss on forums? While the F gen is an enthusiast car too, a large portion of these are leased/company/exec cars originally - so potentially less forum presence.
I own another car with much lower production numbers so that alone isn't the reason - the forum for it far more active and has a really active enthusiast following - so type of car/owner/use purpose are a large factor too. And as @HeyKC said the M5s with the same engine cover a lot of the M6 discussions.
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