[quote=Yog Sothoth]
Does that mean people are trying to be more powerful than everyone else? That sounds like God-modding
[/quote]

I suppose that it could be close to god modding.

[url=http://harrypotter.wikia.com/wiki/Thestral_tail_hair]

[i]A Thestral tail hair is a hair taken from the tail of a Thestral, and is used as a wand core. It is regarded as an unstable, if not difficult substance to use in wand making, though Veela Hair is also described as such, but has been successfully utilised.[/i]

Also, there's this from the wiki

[i]It is assumed that one must be able to see Thestrals in order to utilise their hair, and since one must witness death first-hand to see a Thestral, anyone wishing to forge a wand with the hair must witness death, tying in with the story of being "Master of Death." It is unknown if the tail hair would be invisible to a wandmaker who had not seen death, as a Thestral would be, or if it can be seen once its separated from the Thestral[/i]

Honestly, I just don't think it's a good idea do have a Thestral hair wand >_>