I see two other things wrong with your ad.
1.
Your ad looked too much like a counterfeit; When I read your ad it sounded way too perfect. Don't try to jazz up your ad by making it sound like a Bestbuy advertisement.
Example: If you are looking for outstanding performance in a smaller package - whether for home theater or a two channel application - you will be impressed by these NHTs. With 8" passive subs built into each speaker, they provide much deeper bass than you would expect. And, as with all NHTs, they are exceedingly accurate and clear.
Sometimes that will get you flagged...
2.
At the end of your ad, you said "Please email via craigslist if interested", everyone on CL will already know this, so take out that last part.
Again, may get you flagged.