I have been thinking about this since the day I found out that the top 0.5% of pvpers will get the frostwyrm mount. We all know that pvpers with alot of money can buy them self to achivment, tokens, and mounts (like the one from sart+3).
So I was thinking about a mount that only real raiders can get, maybe something like 10 first on server or server first to down the lich king. Maybe some pvpers can buy themself to this, but I dont think alot of ppl would say "no, I would rather have some money then the uniqe achivment + mount that shows Im a one of the best raiders on my server".