Clickbank have been in business since 1998, they are one of the biggest and online credit card processing company and have done over 1.5 billion dollars worth of of transaction and I'm certain that they would have the best security money can buy. It will take more than speculations on the internet to convince us that they are not trust worthy.
I've dealt with Clickbank hundreds of times without a problem. Could be your bank that is the problem, mine often refuse to send payments to places, not becasue there is anything wrong, they say they have software that sends out certain blocks at various times(very vague) and there is nothing they can do about it. Like software has a mind of its own, or does it do what it is programmed to do.
I am in the process of changing my bank.
I had problems with ClickBank when I used their processor (I was over charged & double charged, more than once). Now I use PayPal as the processor and have not had any problems since.
Clickbank is not compromised. If you go to http://clickbank.com/ and scroll down to there "News to Use" section in the middle of the page you'll see nothing about Clickbank being Compromised.