Wild fluctuation of price is inevitable. Bitcoin ecosystem is still very small market compared to real currency, and they are drawing too much attention nowadays.

Check out Volkswagen's stock fluctuation between SEP 08 - NOV 08. (code - VOW:GR)

VW's market capital is 70B Euro today which is 63 times larger than bitcoin's market cap and one VW stock is slightly more expensive than 1.0 bitcoin.

Still they had a huge fluctuation between SEP 08 - NOV 08 when people started to trade 5~15 millions of VW shares for daily basis.

Bitcoin's daily trading volume is 150-350k which is larger than daily trading volume of VW, the 70B worth company.