sure, people do M+ for gear... same as raids, pvp, world content... pretty much anything in wow - isnt this whole thread about having rewarding solo content? so gear is surely motivation for shitload of players
but describing 84% as "notable minority" seems a bit off... especialy by someone who pushes the idea that 60%+ (by his own asspull, no data) people are solo players...
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considering 58% have done keystone master at some point we can safely assume its not so low