Blizzard is really cleaning the economy, and I have to commend them on it. But it still hurts when you get caught in these things. I lost 35,000 gold on this last account.
Blizzard is now banning "black" accounts (aka blackmarket). These are accounts which may have been made illegitimately.
If you had planned to buy gold in the near future, but were holding off for rates to go down, buy it now instead.
With the recent ban waves, chances are the rates are going to climb sky high. I have already seen them starting to climb.