Then don't open the thread. You can browse the entire rest of the internet without viewing these threads.
Though to defend these threads somewhat, I disagree wholeheartedly about it just being another way to be a pretentious twat. I don't give a fuck about actually hiding my powerlevel, but I do appreciate the aesthetic of most powerlevel wallpapers. I could have a wallpaper that's just a massive anime face that says "HEY I WATCHED TATAMI GALAXY AND KIND OF LIKED THE ARTSTYLE," or I could just have this wallpaper. Which sounds better?