[waffenklang]

Because it offers the opportunity to trade without the shadow market of banks and financial regulators which get pennys of every damn good you buy without doing something important.

the only problem is exchanging bitcoins which is the root of all evil for a non-backed per-trade-valued currency.

[danielweber]

I can go right to my online bank and have them send a payment to anyone in the country, at zero charge.

[DougWebb]

The charge is hidden. The US dollar, and every other national-bank-backed currency, is debt-based. For every dollar that's put into the economy by the national bank, a bit more than a dollar is owed to the bank. That makes it impossible to pay back the debt without inflating the currency, which reduces the value of the dollar (what it can buy) to less than the original dollar+debt amount.

That's the short version of the explanation I've read about the "evils" of central banks and debt-based currencies. I'm no expert, so I can't really judge the accuracy of this explanation or whether or not it's evil.