Pottermore has a bit more information about wandlore specifically relating to the creation of wands in elder wood.
According to Ollivander, wandmakers tend to avoid it because;
- It's difficult to work with
- It's perceived to be unlucky (which means they're difficult to sell)
- The wands are notoriously disloyal
- Only the most exceptional wizards will be able to master the wand
The rarest wand wood of all, and reputed to be deeply unlucky, the elder wand is trickier to master than any other. It
contains powerful magic, but scorns to remain with any owner who is
not the superior of his or her company; it takes a remarkable wizard
to keep the elder wand for any length of time. The old superstition,
‘wand of elder, never prosper,’ has its basis in this fear of the
wand, but in fact, the superstition is baseless, and those foolish
wandmakers who refuse to work with elder do so more because they doubt
they will be able to sell their products than from fear of working
with this wood. The truth is that only a highly unusual person will
find their perfect match in elder, and on the rare occasion when such
a pairing occurs, I take it as certain that the witch or wizard in
question is marked out for a special destiny. An additional fact that
I have unearthed during my long years of study is that the owners of
elder wands almost always feel a powerful affinity with those chosen
Whether because of the fact that Death makes the fictional wand out of elder in Beedle’s story, or because power-hungry or violent wizards
have persistently claimed that their own wands are made of elder, it
is not a wood that is much favoured among wandmakers.
From "The Tales of Beedle the Bard"