Cacao nibs–which taste like chocolate would taste if you hated yourself–do not melt, so they are not a suitable replacement for raw cacao powder so you shouldn’t buy them just because they’re cheaper.
Also, cacao nibs have caffeine in them (clearly, since chocolate has caffeine in it) so that coconut milk hot chocolate nightcap is only going to lead to terrible terrible insomnia.
And you won’t be able to return them because Erewhon doesn’t take returns on opened items.
Lastly, cacao nibs are really great source of magnesium.