Some people don't like that fiat currencies allow money to be created out of thin air. Using a commodity based currency like bitcoins shrinks the fiat economy and increases the commodity based economy. There's a growing movement in a the United States centered around ending the Federal Reserve and returning to a commodity based currency.
Noone, or very few people, would trade their convenience and/or risk their money for these ideological reasons.
Some people don't like that all electronic financial transactions have to go through and be approved by a large financial institution. Bitcoin transactions don't go through any financial institution, so there's never a fee and transactions can't be declined.
There's the paypal (or whatever you'll be using to move the money in and out) transaction fee. Paypal must also approve the transaction. If bitcoin started getting known and was used by a lot of people, paypal can and will cause Satoshi legal headaches. He will not be left alone; governments don't like this sort of activity. Paypal (along with moneybookers etc) will be more than happy to provide the government with transaction logs which will end up with Satoshi or anyone utilizing their services in trouble. I can imagine the headlines now:
Inventor of a new money laundering technique used in fraud; purchasing child porn; and funding terrorism arrested.Thanks to the cooperation of paypal with the FBI, the founders of "Bitcoin" have been brought to justice. Bitcoin is a new money laundering technique which was used by criminals to... etcSome people don't like that the government can subpoena your complete financial history and companies can review your credit history without your permission. Bitcoins are like cash in that transactions can be made anonymously and thus can't be subpoenaed by the government or reviewed by companies.
Under the current system, with very few brokers who are also using non-anonymous "converters" (methods to convert BTC to cash & vice-versa), transactions are practically known: If I buy $150 worth of BTC from Satoshi today and tommorow someone sells $147 worth, paypal will know (if they want) that I was sending $147 to that person. Granted, technically they can't "prove" it, but they couldn't also prove Al-Capone was the Mafia's head; that didn't stop them from getting him because they knew.
Some people like to earn a little cash on the side with virtually no work required. It's as easy as clicking 'Generate Coins' and opening a PayPal account.
It also costs electricity. Sooner or later it will hit the equilibrium so that it's virtually profitless.
Some people believe bitcoins are a good investment. There are more than a few people interested in using bitcoins and that's all that is needed to guarantee that they will increase in value over time.
That might make some people stash bitcoin, but not use it in transactions. Not good enough.
Some people use bitcoins because they think that they are an interesting experiment and want to see how and by whom bitcoins will be adopted.
And we are trying to make the experiment successful here
. This is impossible without anonymity.
Some people want to organize political resistance without attracting attention.
Some people want to transmit value in trade for drugs and weapons.
Especially those type of people will not be very happy using BTC if the only way to put and pull money from it was paypal!