It's partly the fact that for Westerners at least, Leica ownership is a realistic aspiration. Even low paid workers can, if they save hard and forego other pleasures, attain Leica ownership of some variety in a way they couldn't with fast cars, race horses or yachts. So Leica is a kind of democratic luxury, and gives everyone the ability to sound off one way or the other on its benefits.
I understand the desire because I succumbed to it, rather half heartedly when the price and condition was too good for me to pass on, but it was too like the experience of other cameras to be seduced by the pull. I knew it would bounce around in a normal shoulder bag and be dragged out at a moments notice, like my other cameras, and someone else would fuss over it in a way I wasn't prepared to. So I'm rather been there-done that about Leica. My XA's are much smaller, my Kiev is quirkier, my Nikons as solid and lots of cameras have sharp lenses, especially at the middling apertures I usually shoot. I certainly don't hate Leicas or Leica owners, but as photographic tools they have far more competition that their heyday,