It's not good for the BitCoin economy. It makes it obvious that BitCoin is not really a stable currency and that single actors can significantly move the market. Wild, unpredictable fluctuations in exchange rate make business hard and make BitCoin seem flaky.
If Bitcoin is successful and there is adoption by millions of users, a huge increase in value, perhaps 1000-fold, is unavoidable.
Such a strong rally is desirable for a fixed supply currency because it indicates increase in adoption.
Also, the higher the value, the more difficult it becomes for a single actor to move the market.
As for wild, unpredictable fluctuations, this can be solved trivially with currency hedging and futures trading. Some are working on offering these services. Just give it some time. It's still early days.