Sean,
As jweiss points out, buying WoW gold can get your account banned.
But there is also another point that people don't consider when they buy gold. The people who sell gold don't just go out and farm mobs. They also:
1. Spam chat in IF.
2. Trick people out of gold using fake in-game mails and other methods.
3. Worst of all, hack people's accounts using trojans and other means and then strip the character of all gold and items (vendoring the items) and sell the resulting gold.
By buying gold from them you are supporting such activities, especially #3 which is actively hurting many player.
Please don't buy WoW gold. If you are having issues raising gold, and you are level 70, talk to the community - here or on the WoW forums or your guild forums. There will be many who will be happy to advise you on how to grind gold yourself (best locations, professions, classes etc.).
