It is a matter of subjective taste and perceptions. Yes, these are essentially all dolls, and certainly they are toys that are things typically made for children based on children's comic books and cartoons and we are all immature and overly nostalgic, etc. etc. etc.
But most of the board members here, I would dare to wager, would not buy or pose Barbies or Tonner dolls with their Sideshow and Hot Toys figures. Why? Because it crosses a line of some kind. A subjective line that only exists in the mind of those collectors (myself included)? Perhaps, but there is a line somewhere for most of us. Similarly, there is a line that many refuse to cross regarding buying those scantily clad anime figures that look like pre-teens. I find those disturbing, and would never get one of those. Does that mean people who collect them are all weirdo perverts? Not necessarily, though some (many) probably are.
Do He-Man and the Gladiator look like something male homosexuals would find desirable? Though I'm not a homosexual, I would assume so. And personally, I would not feel comfortable having that on my shelf, because it is a bit creepy to me having some extremely realistic, nearly naked, roided up guy on my shelf. I've got nothing against homosexuals. I actually do have homosexual friends and co-workers. But I don't want Tom of Finland or the lesbian dolls with dildos or Leonidas in his gay male fantasy suit on my display. Again, I can understand some people loving the movie and all that, and that's fine, but this is my perspective and it is just as legitimate as anyone's. I don't think it is hypocritical to collect dolls yet not want overly gay looking dolls on your display.