Darkcoin's anonymity feature sounds great in theory; but in reality, it seems to be an enabler for scammers, pedophiles and drug dealers. Darkcoin simply doesn't seem ethical and that is why I never put money in it, even though I knew a pump was going to happen before it did (the hype was there for everyone to see).
Rationalizing Darkcoin to succeed is like rationlizing Maidsafe to succeed.. it's simply poor logic, we've had services like TOR for over a decade and 99.99999% of internet users still use internet explorer, firefox, chrome, netscape, et al. The mainstream public just doesn't seem to go for the anonymity stuff.
People use netscape still?! WOW! lol