Ran into the same exact issue when selling my ipad. Add insult to injury by having to deal with CL "help" forums which were just really a bunch of teenagers bwahahaing at me for getting flagged. I did finally reword my ad like you did to avoid the flagbotters, but it really shook my faith in craigslist. BTW I listed my 64gb 3g with apple case for $550, before that it was listed at $599 and I guess that price didn't meet approval with the flagbotters. It sold for $550.
Wow. Almost the exact same experience here. Flagged 3 times when I had a long, thorough description and $599 price tag (64+3G+3 cases). I posted on the CL forum and the obnoxious, juvenile, know-it-alls ripped me as having too high a price. They were very condescending and suggested $350 was fair for ANY iPad. They really pissed me off.
So I posted again with a one line description. Sold it for $550 6 hours later.
It think there was a coordinated effort to delete fair priced posts to drive down costs with so many offered for sale. Total scam.