Earlier quoted context omitted.
Not sure about the definition of "improving the site" here. How about some sort of reputation system? And decent moderation? As it stands, CL is a great way to (not) meet flaky people, and to have your posts taken down on the indecipherable whims of a few obsessive users. I've gotten one job, bought a few things, sold one motorcycle, and gave away most of my possessions via CL, and it was consistently an awful, frust…
It always takes more than "a few obsessive users," and there is a flag help forum on Craigslist to help explain how your ad might have trammeled your area's standards.
As far as I'm aware, nobody knows what logic or thresholds are used by CL. Common wisdom is that it's "lots" but there seems to be no reason whatsoever to think that.