Seeing a few of these lately I had an idea.
When one of these idiots tries to post a for sale thread instead of a message saying they don't have privileges they should get a message that says
"You cannot post for sale threads at this time. Please read the sticky located at this link." and give them the link to the sticky. And say posting questions answered in the sticky will result in their permanent banning from the forum.
That way if they post one of these threads, you can just ban them.
When one of these idiots tries to post a for sale thread instead of a message saying they don't have privileges they should get a message that says
"You cannot post for sale threads at this time. Please read the sticky located at this link." and give them the link to the sticky. And say posting questions answered in the sticky will result in their permanent banning from the forum.
That way if they post one of these threads, you can just ban them.