GregSY we have customers that act like our estimator works for them! As we say, No pay, no stay. Some "customers" we just can't afford.
Had a husband and wife team that would demand 10's of thousands of dollars in changes to a spec house! I'd let their offer set for about 23 hrs, and then just say "No" in big letters on it. They wrote a half dozen PA's before we caught on to their angle. No one ever closed them to my knowledge. It was just their way to see what they could get a builder to agree to. They wanted it all for nothing.

It was that kind of stuff that makes me sympathetic to what John said at the beginning.

Crap, or get off the pot.

Out there doing it best I can.