You don't see any value in a currency that can't be counterfeited, manipulated by a central bank and also enables great privacy & low-fee transactions?
And really I rather like the idea of a central bank that is able to help stabilise currency by taking various actions, but then I'm not someone that gets upset at inflation 'stealing' value from my savings. Governments and central banks can help keep money and food prices relatively stable.
The privacy, yeah, good I guess. Low-fee... don't really care. The lack of any sort of chargeback facility makes the entire system very unattractive for someone who is not an online seller.
Although there are some ideas about how to reduce the amount of computing the network needs to prevent an attacker from forking the block chain: http://gavintech.blogspot.com.ar/2012/05/neutralizing-51-att...
Another social advantage of bitcoin is that you can make transactions without being at the mercy of a payment processor. Wikileaks vs. visa and mastercard, for example.
However I don't think it covers all the cases for a payment method, and as I say, I quite like some of the features of centrally controlled currency.