Gareth's probably right on Fraud, but the most valuable thing you lose is credibility. Even when everyone is anonymous, you don't poo where you eat so to speak.
What do you mean?
How do you have accountability or credibility with complete anonymity? I'm sorry but bitcoin history does not agree with your assertion - nckrazze started a PPT and lied about it being a PPT with only two week's investment in the forums.
How many accounts has Atlas had, again?
By not being completely anonymous - giving large sums of money to people who are completely anonymous is a bad idea, even if you have the technology to do so.