At this stage I'm not entirely sure what's going on, I'm presuming it's something to do with out of the ordinary click activity originating on the site, and considering Google's track record about such things I don't really anticipating finding out either way, even if I do by some sort of miracle get my account reactivated.
So, for now at least, enjoy your Daily ACK advert free...
Update: ...and that, is very much, that,
...after thoroughly reviewing your account data and taking your feedback into consideration, we have re-confirmed that your account poses a significant risk to our advertisers. For this reason, we are unable to reinstate your account.