Why do I say that?
Because here's what now happens if one does post an ad on CL...
One will get BOGUS responses (spam). And there's no way to tell (before opening), which email responses are real, and which are bogus.
The problem is now SO BAD, posting an ad on CL definitely WILL yield BOGUS incoming emails -- it is a SURE THING.
So... congratulations spammers, you just rendered CL useless -- or at least made it a big pain in the butt to use CL.
Spam sucks. Spammers are parasites.