I also think this is a good idea. If I was asked to spend an afternoon solving problems that aren't theoretical 'how do you sort an array of a billion integers'

I also think this is a good idea. If I was asked to spend an afternoon solving problems that aren't theoretical 'how do you sort an array of a billion integers' type then I wouldn't want to do it for free. If it gains traction it might reduce the crazy interview only questions from circulation.