Burly, I can tell you that ads from businesses do not last long on Craigslist. Some people do not like the idea of Craigslist becoming too "commercial" and they will flag the post. Posting in more than a few sections will also get them flagged really fast.
I would not automatically suspect your competition. It is pretty hard for one person to get an ad flagged that fast.
I would recommend leaving your company name out of the title of your ad, that will get you flagged right away.
Bookmarks