Originally Posted by Gnidrologist 
I find it odd, that vampire mythology is found to be niche, when considering how there's lots of movies, novels and various merchandise centred around the vampire shtick.
That was my thinking as well - I was very surprised to learn that the use of the Vampire world was a audience-limiter.
Originally Posted by Gnidrologist 
I guess Planescape was for niche players too?
Since PS:T sold ~75k copies, I'd say yes …