This sounds similar to Shawn Ray's complaints, everytime FLEX put a muscular WWE wrestler on the cover of FLEX.
FLEX is about guys with big muscles (granted, most of them are IFBB pros or NPC top amateurs). But, I have no issue with Triple H, John Cena, or Batista being featured on the cover.
By that same token, I don't see a huge problem with Kardashian being on Muscle & Fitness-Hers, every now and again.
At least, the fitness girls don't have to worry about losing at least 2 covers a years to Cory Everson or Rachel McClish, the way male bodybuilders lose multiple cover opportunities in the muscle magazines to Arnold (who hasn't competed in nearly 30 years).