Yes, I have to admit that during testing, I have spotted several errors and these may cause financial losses. Because of this, I have even deleted some features which many people consider useful (such as BTC deposit/withdrawal).
Security is a key concern for a financial system. I totally agree with your point.
The Bitcoin market is filled with exactly highly intelligent people. I will definitely pay attention to every single detail.
(If you see any bugs please email me. I will definitely appreciate that!)
All you need in order to be exploited is to be using software with 0day exploits. Many known exploits are not public. In a very real sense, you are only protected to the extent that you are a small target.
As the potential payoff of a hacker approaches $1 million, the likelihood of being hacked approaches 90%. Software really is THAT insecure and bitcoin thefts are not prosecuted making it basically risk-free to steal bitcoins.