Gary Shea said, "Frankly I don't mind the commercial posts too
much, unless they're posted in screamy upper case and full of
unverified hype."

I actually like seeing a few offering solicitations, whether they
come from commercial businesses or individuals.  But Gary's list
is only part of what irritates me.

All capitals generally indicates a super novice or slimeball.
Describing claims while omitting good description = irritation.
Purposefully omitting an initial offering price = irritation.
Mindlessly omitting approximate vehicle location = irritation.
Omitting necessary distinguishing characteristic = irritation.
Obviously "sucker hunting" abusive prices = irritation.