Originally Posted by
Vaedan
I don't think applying themes and features from other universes is a good way to go. Wow lore is inspired by many sources, but in the end, it creates its own image of the setting. Also, as other said, you also misinterpret WoW elf races a bit.
High elves are not in fact pure elves. Night elves are. High elves are descendants of Highborne who abused Arcane magic of Well of Eternity. Their appearance changed greatly thanks to their exposure to the Sunwell once they founded Quel'thalas.
The level of Fel corruption blood elves were exposed was not that dramatic. Green eyes and darker skin tones are result of Fel Radiation from crystals found in Quel'thalas, but majority of population siphoned magic from vermins and critters, and even sentient beings in some cases. Only very few blood elves directly fed upon demonic magic and these elves were either Kael's felblood elves or illidari recruits. The main difference between quel'dorei and sin'dorei has always been political and philosophical.
Void elves did not started their practises of the Void out of thirst for magic. Their thirst has been sated by the Sunwell for years now. Their motivation was exploration of new source of magic, which is largely unknown and is full of potential. Umbrics notes says to do so to defend Quel'thalas from harm, not to harness these powers for selfish ends, so their motives are not entirely selfish. Eventually, Void elves turned out to be more freethinkers and visionaries, moving past established boundaries of their society. Unfortunately, their research was considered dangerous for Sunwell, so they were exiled. In their aestetics, they are more of "Space elf" then "dark elf" from the very beginning. Just look at their heritage armor.
I'd like to mention that none of wow elf races can be really considered Dark Elf as we know this archetype from other universes. For example, Drow are extremely cruel, sadistic, unforgiving and secluded race based on worship of straight out evil goddess, making them antagonists most of time. No playable race in WoW will meet this criteria. Even Forsaken were given some positive features.