I think it all depends on the builder. Some builders need to dump properties as they are way over their heads. But I do agree if has a low days on market, yes I agree with you that they most likely will wait it out.
But then again I know builders who put a giant cushion in the price so when an offer comes in they have that wiggle room.
Just like Linda said, consult a realtor and see what the true value is and go from there.
Dont focus so much on list price but rather what the home is truely worth.
Are you using a realtor to help you? They would be able to look up comps and give you an idea of what it should appraise for. Then you could make your offer based on that info.