Don recently posted some cultivation info on it.
I have firsthand knowledge of one person who grows it, and he grew it
from a seedling. It's about 10 years old, is still only about 1'
high, and has never pitchered.
On the other hand, Peter D'Amato showed me what are supposed to
be N. rajah in vitro plants from Thomas Alt. Someone on this
list has one. They were pitchering up, so perhaps the in-vitro
culture produced a happier plant than the ones grown from
seed...
Personally I'm interested in the Heliamphora, and maybe a couple
of highland Nepenthes. I've dealt with the ideosyncracies of H.
before, and would like to have have at least one species to
grow. I had one years ago from Bob Ziemer, but that was the
plan where I got my learning experience, and it died :-(.
(If anyone wants to sell H. material I'd give serious consideration
to paying a fair price.)
Robert